8425 files changed, 677867 insertions, 1302132 deletions

diff --git a/.document b/.document
index b6dfcdeee0..8616203552 100644
--- a/.document
+++ b/.document
@@ -10,30 +10,17 @@
 # prelude
 prelude.rb
 rbconfig.rb
-
 array.rb
 ast.rb
 dir.rb
 gc.rb
-hash.rb
+integer.rb
 io.rb
 kernel.rb
-marshal.rb
-rjit.rb
-numeric.rb
-nilclass.rb
 pack.rb
-ractor.rb
-string.rb
-symbol.rb
-timev.rb
-thread_sync.rb
 trace_point.rb
 warning.rb
-yjit.rb
-
-# Errno::*
-known_errors.inc
+ractor.rb
 
 # the lib/ directory (which has its own .document file)
 lib
@@ -49,7 +36,11 @@ README.ja.md
 
 COPYING
 COPYING.ja
+CONTRIBUTING.md
 
 LEGAL
 
+# win32/README.win32 linked from README.md
+win32
+
 doc
diff --git a/.gdbinit b/.gdbinit
index b778305c8d..49380951b8 100644
--- a/.gdbinit
+++ b/.gdbinit
@@ -1,7 +1,23 @@
+set startup-with-shell off
+
+define hook-run
+  set $color_type = 0
+  set $color_highlite = 0
+  set $color_end = 0
+end
+
 define ruby_gdb_init
-  init-if-undefined $color_type = "\033[31m"
-  init-if-undefined $color_highlite = "\033[36m"
-  init-if-undefined $color_end = "\033[m"
+  if !$color_type
+    set $color_type = "\033[31m"
+  end
+  if !$color_highlite
+    set $color_highlite = "\033[36m"
+  end
+  if !$color_end
+    set $color_end = "\033[m"
+  end
+  if ruby_dummy_gdb_enums.special_consts
+  end
 end
 
 # set prompt \033[36m(gdb)\033[m\040
@@ -51,7 +67,7 @@ define rp
     printf "%sT_OBJECT%s: ", $color_type, $color_end
     print ((struct RObject *)($arg0))->basic
     if ($flags & ROBJECT_EMBED)
-      print/x *((VALUE*)((struct RObject*)($arg0))->as.ary) @ (rb_shape_get_shape($arg0)->capacity)
+      print/x *((VALUE*)((struct RObject*)($arg0))->as.ary) @ (ROBJECT_EMBED_LEN_MAX+0)
     else
       print (((struct RObject *)($arg0))->as.heap)
       if (((struct RObject*)($arg0))->as.heap.numiv) > 0
@@ -83,11 +99,13 @@ define rp
     set $regsrc = ((struct RRegexp*)($arg0))->src
     set $rsflags = ((struct RBasic*)$regsrc)->flags
     printf "%sT_REGEXP%s: ", $color_type, $color_end
-    set $len = ((struct RString*)($arg0))->len
+    set $len = ($rsflags & RUBY_FL_USER1) ? \
+            ((struct RString*)$regsrc)->as.heap.len : \
+            (($rsflags & (RUBY_FL_USER2|RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6)) >> RUBY_FL_USHIFT+2)
     set print address off
     output *(char *)(($rsflags & RUBY_FL_USER1) ? \
-            ((struct RString*)$regsrc)->as.heap.ptr : \
-            ((struct RString*)$regsrc)->as.embed.ary) @ $len
+	    ((struct RString*)$regsrc)->as.heap.ptr : \
+	    ((struct RString*)$regsrc)->as.ary) @ $len
     set print address on
     printf " len:%ld ", $len
     if $flags & RUBY_FL_USER6
@@ -108,26 +126,26 @@ define rp
       printf "%sT_ARRAY%s: len=%ld ", $color_type, $color_end, $len
       printf "(embed) "
       if ($len == 0)
-        printf "{(empty)} "
+	printf "{(empty)} "
       else
-        print/x *((VALUE*)((struct RArray*)($arg0))->as.ary) @ $len
-        printf " "
+	print/x *((VALUE*)((struct RArray*)($arg0))->as.ary) @ $len
+	printf " "
       end
     else
       set $len = ((struct RArray*)($arg0))->as.heap.len
       printf "%sT_ARRAY%s: len=%ld ", $color_type, $color_end, $len
       if ($flags & RUBY_FL_USER2)
-        printf "(shared) shared="
-        output/x ((struct RArray*)($arg0))->as.heap.aux.shared_root
-        printf " "
+	printf "(shared) shared="
+	output/x ((struct RArray*)($arg0))->as.heap.aux.shared_root
+	printf " "
       else
-        printf "(ownership) capa=%ld ", ((struct RArray*)($arg0))->as.heap.aux.capa
+	printf "(ownership) capa=%ld ", ((struct RArray*)($arg0))->as.heap.aux.capa
       end
       if ($len == 0)
-        printf "{(empty)} "
+	printf "{(empty)} "
       else
-        print/x *((VALUE*)((struct RArray*)($arg0))->as.heap.ptr) @ $len
-        printf " "
+	print/x *((VALUE*)((struct RArray*)($arg0))->as.heap.ptr) @ $len
+	printf " "
       end
     end
     print (struct RArray *)($arg0)
@@ -422,11 +440,13 @@ end
 
 define output_string
   set $flags = ((struct RBasic*)($arg0))->flags
-  set $len = ((struct RString*)($arg0))->len
+  set $len = ($flags & RUBY_FL_USER1) ? \
+          ((struct RString*)($arg0))->as.heap.len : \
+          (($flags & (RUBY_FL_USER2|RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6)) >> RUBY_FL_USHIFT+2)
   if $len > 0
     output *(char *)(($flags & RUBY_FL_USER1) ? \
-            ((struct RString*)($arg0))->as.heap.ptr : \
-            ((struct RString*)($arg0))->as.embed.ary) @ $len
+	    ((struct RString*)($arg0))->as.heap.ptr : \
+	    ((struct RString*)($arg0))->as.ary) @ $len
   else
     output ""
   end
@@ -434,11 +454,13 @@ end
 
 define print_string
   set $flags = ((struct RBasic*)($arg0))->flags
-  set $len = ((struct RString*)($arg0))->len
+  set $len = ($flags & RUBY_FL_USER1) ? \
+          ((struct RString*)($arg0))->as.heap.len : \
+          (($flags & (RUBY_FL_USER2|RUBY_FL_USER3|RUBY_FL_USER4|RUBY_FL_USER5|RUBY_FL_USER6)) >> RUBY_FL_USHIFT+2)
   if $len > 0
     printf "%s", *(char *)(($flags & RUBY_FL_USER1) ? \
-            ((struct RString*)($arg0))->as.heap.ptr : \
-            ((struct RString*)($arg0))->as.embed.ary) @ $len
+	    ((struct RString*)($arg0))->as.heap.ptr : \
+	    ((struct RString*)($arg0))->as.ary) @ $len
   end
 end
 
@@ -522,13 +544,13 @@ end
 
 define rp_class
   printf "(struct RClass *) %p", (void*)$arg0
-  if RCLASS_ORIGIN((struct RClass *)($arg0)) != $arg0
-    printf " -> %p", RCLASS_ORIGIN((struct RClass *)($arg0))
+  if ((struct RClass *)($arg0))->ptr.origin_ != $arg0
+    printf " -> %p", ((struct RClass *)($arg0))->ptr.origin_
   end
   printf "\n"
   rb_classname $arg0
   print/x *(struct RClass *)($arg0)
-  print *RCLASS_EXT((struct RClass *)($arg0))
+  print *((struct RClass *)($arg0))->ptr
 end
 document rp_class
   Print the content of a Class/Module.
@@ -667,6 +689,11 @@ define nd_stts
 end
 
 
+define nd_entry
+  printf "%su3.entry%s: ", $color_highlite, $color_end
+  p ($arg0).u3.entry
+end
+
 define nd_vid
   printf "%su1.id%s: ", $color_highlite, $color_end
   p ($arg0).u1.id
@@ -841,22 +868,22 @@ define rb_numtable_entry
     set $rb_numtable_p = $rb_numtable_tbl->as.packed.bins
     while $rb_numtable_p && $rb_numtable_p < $rb_numtable_tbl->as.packed.bins+$rb_numtable_tbl->num_entries
       if $rb_numtable_p.k == $rb_numtable_id
-        set $rb_numtable_key = $rb_numtable_p.k
-        set $rb_numtable_rec = $rb_numtable_p.v
-        set $rb_numtable_p = 0
+	set $rb_numtable_key = $rb_numtable_p.k
+	set $rb_numtable_rec = $rb_numtable_p.v
+	set $rb_numtable_p = 0
       else
-        set $rb_numtable_p = $rb_numtable_p + 1
+	set $rb_numtable_p = $rb_numtable_p + 1
       end
     end
   else
     set $rb_numtable_p = $rb_numtable_tbl->as.big.bins[st_numhash($rb_numtable_id) % $rb_numtable_tbl->num_bins]
     while $rb_numtable_p
       if $rb_numtable_p->key == $rb_numtable_id
-        set $rb_numtable_key = $rb_numtable_p->key
-        set $rb_numtable_rec = $rb_numtable_p->record
-        set $rb_numtable_p = 0
+	set $rb_numtable_key = $rb_numtable_p->key
+	set $rb_numtable_rec = $rb_numtable_p->record
+	set $rb_numtable_p = 0
       else
-        set $rb_numtable_p = $rb_numtable_p->next
+	set $rb_numtable_p = $rb_numtable_p->next
       end
     end
   end
@@ -934,7 +961,7 @@ define iseq
       set $operand_size = ((INSN*)($arg0))->operand_size
       set $operands = ((INSN*)($arg0))->operands
       while $i < $operand_size
-        rp $operands[$i++]
+	rp $operands[$i++]
       end
     end
   end
@@ -952,8 +979,8 @@ end
 
 define rb_ps_vm
   print $ps_vm = (rb_vm_t*)$arg0
-  set $ps_thread_ln      = $ps_vm->ractor.main_ractor.threads.set.n.next
-  set $ps_thread_ln_last = $ps_vm->ractor.main_ractor.threads.set.n.prev
+  set $ps_thread_ln = $ps_vm->living_threads.n.next
+  set $ps_thread_ln_last = $ps_vm->living_threads.n.prev
   while 1
     set $ps_thread_th = (rb_thread_t *)$ps_thread_ln
     set $ps_thread = (VALUE)($ps_thread_th->self)
@@ -1075,11 +1102,11 @@ define print_id
           set $arylen = $ary->as.heap.len
         end
         set $result = $aryptr[($serial % ID_ENTRY_UNIT) * ID_ENTRY_SIZE + $t]
-        if $result != RUBY_Qnil
+	if $result != RUBY_Qnil
           print_string $result
-        else
-          echo undef
-        end
+	else
+	  echo undef
+	end
       end
     end
   end
@@ -1104,7 +1131,7 @@ define rb_ps_thread
   set $ps_thread = (struct RTypedData*)$arg0
   set $ps_thread_th = (rb_thread_t*)$ps_thread->data
   printf "* #<Thread:%p rb_thread_t:%p native_thread:%p>\n", \
-    $ps_thread, $ps_thread_th, $ps_thread_th->nt
+    $ps_thread, $ps_thread_th, $ps_thread_th->thread_id
   set $cfp = $ps_thread_th->ec->cfp
   set $cfpend = (rb_control_frame_t *)($ps_thread_th->ec->vm_stack + $ps_thread_th->ec->vm_stack_size)-1
   while $cfp < $cfpend
@@ -1252,9 +1279,9 @@ document rb_count_objects
   Counts all objects grouped by type.
 end
 
-# Details: https://github.com/ruby/ruby/wiki/Machine-Instructions-Trace-with-GDB
+# Details: https://bugs.ruby-lang.org/projects/ruby-master/wiki/MachineInstructionsTraceWithGDB
 define trace_machine_instructions
-  set logging enabled
+  set logging on
   set height 0
   set width 0
   display/i $pc
@@ -1289,7 +1316,7 @@ define dump_node
   set $flags = ((struct RBasic*)($str))->flags
   printf "%s", (char *)(($flags & RUBY_FL_USER1) ? \
                         ((struct RString*)$str)->as.heap.ptr : \
-                        ((struct RString*)$str)->as.embed.ary)
+                        ((struct RString*)$str)->as.ary)
 end
 
 define print_flags
@@ -1297,7 +1324,8 @@ define print_flags
   printf "RUBY_FL_PROMOTED0   : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_PROMOTED0 ? "1" : "0"
   printf "RUBY_FL_PROMOTED1   : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_PROMOTED1 ? "1" : "0"
   printf "RUBY_FL_FINALIZE    : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_FINALIZE ? "1" : "0"
-  printf "RUBY_FL_SHAREABLE   : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_SHAREABLE ? "1" : "0"
+  printf "RUBY_FL_TAINT       : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_TAINT ? "1" : "0"
+  printf "RUBY_FL_UNTRUSTED   : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_UNTRUSTED ? "1" : "0"
   printf "RUBY_FL_EXIVAR      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_EXIVAR ? "1" : "0"
   printf "RUBY_FL_FREEZE      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_FREEZE ? "1" : "0"
 
@@ -1321,8 +1349,3 @@ define print_flags
   printf "RUBY_FL_USER17      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_USER17 ? "1" : "0"
   printf "RUBY_FL_USER18      : %s\n", ((struct RBasic*)($arg0))->flags & RUBY_FL_USER18 ? "1" : "0"
 end
-
-source -s misc/gdb.py
-
-# Moved from beginning, since it fails on older gdbs
-set startup-with-shell off
diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
deleted file mode 100644
index de62eb432a..0000000000
--- a/.git-blame-ignore-revs
+++ /dev/null
@@ -1,36 +0,0 @@
-# This is a file used by GitHub to ignore the following commits on `git blame`.
-#
-# You can also do the same thing in your local repository with:
-# $ git config --local blame.ignoreRevsFile .git-blame-ignore-revs
-
-# Expand tabs
-5b21e94bebed90180d8ff63dad03b8b948361089
-c5e9af9c9d890578182a21e7b71b50334cd5579e
-e63a2115f64433b21cb5dd67c5bf8b30f87ef293
-712ac99e4d0384a941c80a9f48f62943ba7d97c0
-d1474affa8e105bece209cc9d594bb0a989859e1
-2da92388b948821269b18d6b178a680f17e41750
-
-# Enable Style/StringLiterals cop for RubyGems/Bundler
-d7ffd3fea402239b16833cc434404a7af82d44f3
-
-# [ruby/digest] Revert tab-expansion in external files
-48b09aae7ec5632209229dcc294dd0d75a93a17f
-8a65cf3b61c60e4cb886f59a73ff6db44364bfa9
-39dc9f9093901d40d2998653948d5da38b18ee2c
-
-# [ruby/io-nonblock] Revert tab expansion
-f28287d34c03f472ffe90ea262bdde9affd4b965
-0d842fecb4f75ab3b1d4097ebdb8e88f51558041
-4ba2c66761d6a293abdfba409241d31063cefd62
-
-# Make benchmark indentation consistent
-fc4acf8cae82e5196186d3278d831f2438479d91
-
-# Make prism_compile.c indentation consistent
-40b2c8e5e7e6e5f83cee9276dc9c1922a69292d6
-d2c5867357ed88eccc28c2b3bd4a46e206e7ff85
-
-# Miss-and-revived commits
-a0f7de814ae5c299d6ce99bed5fb308a05d50ba0
-d4e24021d39e1f80f0055b55d91f8d5f22e15084
diff --git a/.github/actions/compilers/action.yml b/.github/actions/compilers/action.yml
deleted file mode 100644
index ff060ce2e0..0000000000
--- a/.github/actions/compilers/action.yml
+++ /dev/null
@@ -1,125 +0,0 @@
-name: Compiles ruby in a container
-description: >-
-  Makes ruby using a dedicated container
-
-inputs:
-  tag:
-    required: false
-    default: clang-18
-    description: >-
-      container image tag to use in this run.
-
-  with_gcc:
-    required: false
-    description: >-
-      override compiler path & flags.
-
-  CFLAGS:
-    required: false
-    description: >-
-      C compiler flags to override.
-
-  CXXFLAGS:
-    required: false
-    description: >-
-      C++ compiler flags to override.
-
-  optflags:
-    required: false
-    # -O1 is faster than -O3 in our tests... Majority of time are consumed trying
-    # to optimize binaries.  Also GitHub Actions run on relatively modern CPUs
-    # compared to, say, GCC 4 or Clang 3.  We don't specify `-march=native`
-    # because compilers tend not understand what the CPU is.
-    default: '-O1'
-    description: >-
-      Compiler flags for optimisations.
-
-  cppflags:
-    required: false
-    description: >-
-      Additional preprocessor flags.
-
-  append_configure:
-    required: false
-    default: >-
-      --without-valgrind
-      --without-jemalloc
-      --without-gmp
-    description: >-
-      flags to append to configure.
-
-  enable_shared:
-    required: false
-    default: true
-    description: >-
-      Whether to build libruby.so.
-
-  check:
-    required: false
-    default: ''
-    description: >-
-      Whether to run `make check`
-
-  mspecopt:
-    required: false
-    default: ''
-    description: >-
-      Additional options for mspec.
-
-  static_exts:
-    required: false
-    description: >-
-      whitespace separated list of extensions that need be linked statically.
-
-runs:
-  using: composite
-  steps:
-    - shell: bash
-      run: docker pull --quiet 'ghcr.io/ruby/ruby-ci-image:${{ inputs.tag }}'
-
-    - name: Enable Launchable conditionally
-      id: enable-launchable
-      run: echo "enable-launchable=true" >> $GITHUB_OUTPUT
-      shell: bash
-      if: >-
-        ${{
-        github.repository == 'ruby/ruby' ||
-        (github.repository != 'ruby/ruby' && env.LAUNCHABLE_TOKEN)
-        }}
-
-    - name: compile
-      shell: bash
-      run: >-
-        docker run
-        --rm
-        --user=root
-        --volume '${{ github.workspace }}:/github/workspace:ro'
-        --workdir=/github/workspace
-        --entrypoint=/github/workspace/.github/actions/compilers/entrypoint.sh
-        --env CI
-        --env GITHUB_ACTION
-        --env INPUT_WITH_GCC='${{ inputs.with_gcc || inputs.tag }}'
-        --env INPUT_CFLAGS='${{ inputs.CFLAGS }}'
-        --env INPUT_CXXFLAGS='${{ inputs.CXXFLAGS }}'
-        --env INPUT_OPTFLAGS='${{ inputs.OPTFLAGS }}'
-        --env INPUT_CPPFLAGS='${{ inputs.cppflags }}'
-        --env INPUT_APPEND_CONFIGURE='${{ inputs.append_configure }}'
-        --env INPUT_CHECK='${{ inputs.check }}'
-        --env INPUT_MSPECOPT='${{ inputs.mspecopt }}'
-        --env INPUT_ENABLE_SHARED='${{ inputs.enable_shared }}'
-        --env INPUT_STATIC_EXTS='${{ inputs.static_exts }}'
-        --env LAUNCHABLE_ORGANIZATION='${{ github.repository_owner }}'
-        --env LAUNCHABLE_WORKSPACE='${{ github.event.repository.name }}'
-        --env LAUNCHABLE_ENABLED='${{ steps.enable-launchable.outputs.enable-launchable || false }}'
-        --env GITHUB_PR_HEAD_SHA='${{ github.event.pull_request.head.sha || github.sha }}'
-        --env GITHUB_PULL_REQUEST_URL='${{ github.event.pull_request.html_url }}'
-        --env GITHUB_REF='${{ github.ref }}'
-        --env GITHUB_ACTIONS
-        --env GITHUB_RUN_ID
-        --env GITHUB_REPOSITORY
-        --env GITHUB_WORKFLOW
-        --env GITHUB_RUN_NUMBER
-        --env GITHUB_EVENT_NAME
-        --env GITHUB_SHA
-        --env GITHUB_HEAD_REF
-        'ghcr.io/ruby/ruby-ci-image:${{ inputs.tag }}'
diff --git a/.github/actions/compilers/entrypoint.sh b/.github/actions/compilers/entrypoint.sh
deleted file mode 100755
index a9bb5f0bb7..0000000000
--- a/.github/actions/compilers/entrypoint.sh
+++ /dev/null
@@ -1,118 +0,0 @@
-#! /bin/bash
-
-# Copyright (c) 2024 Ruby developers.  All rights reserved.
-#
-# This file is  a part of the programming language  Ruby.  Permission is hereby
-# granted, to  either redistribute and/or  modify this file, provided  that the
-# conditions  mentioned in  the file  COPYING are  met.  Consult  the file  for
-# details.
-
-grouped()
-{
-    echo "::group::${@}"
-    "${@}"
-    echo "::endgroup::"
-}
-
-set -e
-set -u
-set -o pipefail
-
-srcdir="/github/workspace/src"
-builddir="$(mktemp -dt)"
-
-export GITHUB_WORKFLOW='Compilations'
-export CONFIGURE_TTY='never'
-export RUBY_DEBUG='ci rgengc'
-export RUBY_TESTOPTS='-q --color=always --tty=no'
-export RUBY_DEBUG_COUNTER_DISABLE='1'
-export GNUMAKEFLAGS="-j$((1 + $(nproc --all)))"
-
-case "x${INPUT_ENABLE_SHARED}" in
-x | xno | xfalse )
-    enable_shared='--disable-shared'
-    ;;
-*)
-    enable_shared='--enable-shared'
-    ;;
-esac
-
-pushd ${builddir}
-
-grouped git config --global --add safe.directory ${srcdir}
-
-grouped ${srcdir}/configure        \
-    -C                             \
-    --with-gcc="${INPUT_WITH_GCC}" \
-    --enable-debug-env             \
-    --disable-install-doc          \
-    --with-ext=-test-/cxxanyargs,+ \
-    ${enable_shared}               \
-    ${INPUT_APPEND_CONFIGURE}      \
-    CFLAGS="${INPUT_CFLAGS}"       \
-    CXXFLAGS="${INPUT_CXXFLAGS}"   \
-    optflags="${INPUT_OPTFLAGS}"   \
-    cppflags="${INPUT_CPPFLAGS}"   \
-    debugflags='-ggdb3' # -g0 disables backtraces when SEGV.  Do not set that.
-
-popd
-
-if [[ -n "${INPUT_STATIC_EXTS}" ]]; then
-    echo "::group::ext/Setup"
-    set -x
-    mkdir ${builddir}/ext
-    (
-        for ext in ${INPUT_STATIC_EXTS}; do
-            echo "${ext}"
-        done
-    ) >> ${builddir}/ext/Setup
-    set +x
-    echo "::endgroup::"
-fi
-
-ruby_test_opts=''
-tests=''
-
-# Launchable
-setup_launchable() {
-    pushd ${srcdir}
-    # Launchable creates .launchable file in the current directory, but cannot a file to ${srcdir} directory.
-    # As a workaround, we set LAUNCHABLE_SESSION_DIR to ${builddir}.
-    export LAUNCHABLE_SESSION_DIR=${builddir}
-    local github_ref="${GITHUB_REF//\//_}"
-    boot_report_path='launchable_bootstraptest.json'
-    test_report_path='launchable_test_all.json'
-    ruby_test_opts+=--launchable-test-reports="${boot_report_path}"
-    tests+=--launchable-test-reports="${test_report_path}"
-    grouped launchable record build --name "${github_ref}"_"${GITHUB_PR_HEAD_SHA}" || true
-    trap launchable_record_test EXIT
-}
-launchable_record_test() {
-    pushd "${builddir}"
-    grouped launchable record tests --flavor test_task=test --test-suite bootstraptest raw "${boot_report_path}" || true
-    if [ "$INPUT_CHECK" = "true" ]; then
-        grouped launchable record tests --flavor test_task=test-all --test-suite test-all raw "${test_report_path}" || true
-    fi
-}
-if [ "$LAUNCHABLE_ENABLED" = "true" ]; then
-    setup_launchable
-fi
-
-pushd ${builddir}
-
-grouped make showflags
-grouped make all
-grouped make test RUBY_TESTOPTS="${ruby_test_opts}"
-
-[[ -z "${INPUT_CHECK}" ]] && exit 0
-
-if [ "$INPUT_CHECK" = "true" ]; then
-  tests+=" -- ruby -ext-"
-else
-  tests+=" -- $INPUT_CHECK"
-fi
-
-# grouped make install
-grouped make test-tool
-grouped make test-all TESTS="$tests"
-grouped env CHECK_LEAKS=true make test-spec MSPECOPT="$INPUT_MSPECOPT"
diff --git a/.github/actions/launchable/setup/action.yml b/.github/actions/launchable/setup/action.yml
deleted file mode 100644
index cd9d1b6fc9..0000000000
--- a/.github/actions/launchable/setup/action.yml
+++ /dev/null
@@ -1,237 +0,0 @@
-name: Set up Launchable
-description: >-
-  Install the required dependencies and execute the necessary Launchable commands for test recording
-
-inputs:
-  os:
-    required: true
-    description: The operating system that CI runs on. This value is used in Launchable flavor.
-
-  test-opts:
-    default: none
-    required: false
-    description: >-
-      Test options that determine how tests are run.
-      This value is used in the Launchable flavor.
-
-  launchable-token:
-    required: false
-    description: >-
-      Launchable token is needed if you want to run Launchable on your forked repository.
-      See https://github.com/ruby/ruby/wiki/CI-Servers#launchable-ci for details.
-
-  builddir:
-    required: false
-    default: ${{ github.workspace }}
-    description: >-
-      Directory to create Launchable report file.
-
-  srcdir:
-    required: false
-    default: ${{ github.workspace }}
-    description: >-
-      Directory to (re-)checkout source codes. Launchable retrieves the commit information
-      from the directory.
-
-  test-task:
-    required: false
-    default: ${{ matrix.test_task }}
-    description: >-
-      Specifies a single test task to be executed.
-      This value is used in the Launchable flavor.
-      Either 'test-task' or 'multi-test-tasks' must be configured.
-
-  test-tasks:
-    required: false
-    default: '[]'
-    description: >-
-      Specifies an array of multiple test tasks to be executed.
-      For example: '["test", "test-all"]'.
-      If you want to run a single test task, use the 'test-task' input instead.
-
-  is-yjit:
-    required: false
-    default: 'false'
-    description: >-
-      Whether this workflow is executed on YJIT.
-
-runs:
-  using: composite
-
-  steps:
-    - name: Enable Launchable conditionally
-      id: enable-launchable
-      run: echo "enable-launchable=true" >> $GITHUB_OUTPUT
-      shell: bash
-      if: >-
-        ${{
-        (github.repository == 'ruby/ruby'
-          || (github.repository != 'ruby/ruby'
-          && env.LAUNCHABLE_TOKEN))
-        && (inputs.test-task == 'check'
-          || inputs.test-task == 'test-all'
-          || inputs.test-task == 'test'
-          || contains(fromJSON(inputs.test-tasks), 'test-all')
-          || contains(fromJSON(inputs.test-tasks), 'test'))
-        }}
-
-    # Launchable CLI requires Python and Java.
-    # https://www.launchableinc.com/docs/resources/cli-reference/
-    - name: Set up Python
-      uses: actions/setup-python@871daa956ca9ea99f3c3e30acb424b7960676734 # v5.0.0
-      with:
-        python-version: "3.x"
-      if: steps.enable-launchable.outputs.enable-launchable
-
-    - name: Set up Java
-      uses: actions/setup-java@7a445ee88d4e23b52c33fdc7601e40278616c7f8 # v4.0.0
-      with:
-        distribution: 'temurin'
-        java-version: '17'
-      if: steps.enable-launchable.outputs.enable-launchable
-
-    - name: Set global vars
-      id: global
-      shell: bash
-      run: |
-        test_all_enabled="${{ inputs.test-task == 'check' ||  inputs.test-task == 'test-all' || contains(fromJSON(inputs.test-tasks), 'test-all') }}"
-        btest_enabled="${{ inputs.test-task == 'check' ||  inputs.test-task == 'test' || contains(fromJSON(inputs.test-tasks), 'test') }}"
-        echo test_all_enabled="${test_all_enabled}" >> $GITHUB_OUTPUT
-        echo btest_enabled="${btest_enabled}" >> $GITHUB_OUTPUT
-        echo test_all_session_file='launchable_test_all_session.txt' >> $GITHUB_OUTPUT
-        echo btest_session_file='launchable_btest_session.txt' >> $GITHUB_OUTPUT
-        echo test_all_report_file='launchable_test_all_report.json' >> $GITHUB_OUTPUT
-        echo btest_report_file='launchable_btest_report.json' >> $GITHUB_OUTPUT
-      if: steps.enable-launchable.outputs.enable-launchable
-
-    - name: Set environment variables for Launchable
-      shell: bash
-      run: |
-        : # GITHUB_PULL_REQUEST_URL are used for commenting test reports in Launchable Github App.
-        : # https://github.com/launchableinc/cli/blob/v1.80.1/launchable/utils/link.py#L42
-        echo "GITHUB_PULL_REQUEST_URL=${{ github.event.pull_request.html_url }}" >> $GITHUB_ENV
-        : # The following envs are necessary in Launchable tokenless authentication.
-        : # https://github.com/launchableinc/cli/blob/v1.80.1/launchable/utils/authentication.py#L20
-        echo "LAUNCHABLE_ORGANIZATION=${{ github.repository_owner }}" >> $GITHUB_ENV
-        echo "LAUNCHABLE_WORKSPACE=${{ github.event.repository.name }}" >> $GITHUB_ENV
-        : # https://github.com/launchableinc/cli/blob/v1.80.1/launchable/utils/authentication.py#L71
-        echo "GITHUB_PR_HEAD_SHA=${{ github.event.pull_request.head.sha || github.sha }}" >> $GITHUB_ENV
-        echo "LAUNCHABLE_TOKEN=${{ inputs.launchable-token }}" >> $GITHUB_ENV
-      if: steps.enable-launchable.outputs.enable-launchable
-
-    - name: Set up path
-      shell: bash
-      working-directory: ${{ inputs.srcdir }}
-      # Since updated PATH variable will be available in only subsequent actions, we need to add the path beforehand.
-      # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#adding-a-system-path
-      run: echo "$(python -msite --user-base)/bin" >> $GITHUB_PATH
-      if: steps.enable-launchable.outputs.enable-launchable && startsWith(inputs.os, 'macos')
-
-    - name: Set up Launchable
-      shell: bash
-      working-directory: ${{ inputs.srcdir }}
-      run: |
-        set -x
-        pip install --user launchable
-        : # The build name cannot include a slash, so we replace the string here.
-        github_ref="${{ github.ref }}"
-        github_ref="${github_ref//\//_}"
-        : # With the --name option, we need to configure a unique identifier for this build.
-        : # To avoid setting the same build name as the CI which runs on other branches, we use the branch name here.
-        build_name="${github_ref}_${GITHUB_PR_HEAD_SHA}"
-        test_opts="${{ inputs.test-opts }}"
-        test_opts="${test_opts// /}"
-        test_opts="${test_opts//=/:}"
-        test_all_test_suite='test-all'
-        btest_test_suite='btest'
-        if [ "${{ inputs.is-yjit }}" = "true" ]; then
-          test_all_test_suite="yjit-${test_all_test_suite}"
-          btest_test_suite="yjit-${btest_test_suite}"
-        fi
-        launchable record build --name "${build_name}"
-        if [ "${test_all_enabled}" = "true" ]; then
-          launchable record session \
-            --build "${build_name}" \
-            --flavor os=${{ inputs.os }} \
-            --flavor test_task=${{ inputs.test-task }} \
-            --flavor test_opts=${test_opts} \
-            --test-suite ${test_all_test_suite} \
-            > "${test_all_session_file}"
-          echo "TESTS=${TESTS} --launchable-test-reports=${test_all_report_file}" >> $GITHUB_ENV
-        fi
-        if [ "${btest_enabled}" = "true" ]; then
-          launchable record session \
-            --build "${build_name}" \
-            --flavor os=${{ inputs.os }} \
-            --flavor test_task=${{ inputs.test-task }} \
-            --flavor test_opts=${test_opts} \
-            --test-suite ${btest_test_suite} \
-            > "${btest_session_file}"
-          echo "BTESTS=${BTESTS} --launchable-test-reports=${btest_report_file}" >> $GITHUB_ENV
-        fi
-      if: steps.enable-launchable.outputs.enable-launchable
-      env:
-        test_all_enabled: ${{ steps.global.outputs.test_all_enabled }}
-        btest_enabled: ${{ steps.global.outputs.btest_enabled }}
-        test_all_session_file: ${{ steps.global.outputs.test_all_session_file }}
-        btest_session_file: ${{ steps.global.outputs.btest_session_file }}
-        test_all_report_file: ${{ steps.global.outputs.test_all_report_file }}
-        btest_report_file: ${{ steps.global.outputs.btest_report_file }}
-
-    - name: Variables to report Launchable
-      id: variables
-      shell: bash
-      run: |
-        set -x
-        : # report-path from srcdir
-        if [ "${srcdir}" = "${{ github.workspace }}" ]; then
-          dir=
-        else
-          # srcdir must be equal to or under workspace
-          dir=$(echo ${srcdir:+${srcdir}/} | sed 's:[^/][^/]*/:../:g')
-        fi
-        if [ "${test_all_enabled}" = "true" ]; then
-          test_report_path="${dir}${builddir:+${builddir}/}${test_all_report_file}"
-          echo test_report_path="${test_report_path}" >> $GITHUB_OUTPUT
-        fi
-        if [ "${btest_enabled}" = "true" ]; then
-          btest_report_path="${dir}${builddir:+${builddir}/}${btest_report_file}"
-          echo btest_report_path="${btest_report_path}" >> $GITHUB_OUTPUT
-        fi
-      if: steps.enable-launchable.outputs.enable-launchable
-      env:
-        srcdir: ${{ inputs.srcdir }}
-        builddir: ${{ inputs.builddir }}
-        test_all_enabled: ${{ steps.global.outputs.test_all_enabled }}
-        btest_enabled: ${{ steps.global.outputs.btest_enabled }}
-        test_all_report_file: ${{ steps.global.outputs.test_all_report_file }}
-        btest_report_file: ${{ steps.global.outputs.btest_report_file }}
-
-    - name: Record test results in Launchable
-      uses: gacts/run-and-post-run@674528335da98a7afc80915ff2b4b860a0b3553a # v1.4.0
-      with:
-        shell: bash
-        working-directory: ${{ inputs.srcdir }}
-        post: |
-          [[ "${test_all_enabled}" = "true" ]] && \
-            launchable record tests \
-              --session "$(cat "${test_all_session_file}")" \
-              raw "${test_report_path}" || true
-
-          [[ "${btest_enabled}" = "true" ]] && \
-            launchable record tests \
-              --session "$(cat "${btest_session_file}")" \
-              raw "${btest_report_path}" || true
-
-          rm -f "${test_all_session_file}"
-          rm -f "${btest_session_file}"
-          rm -f "${test_report_path}"
-          rm -f "${btest_report_path}"
-      if: ${{ always() && steps.enable-launchable.outputs.enable-launchable }}
-      env:
-        test_report_path: ${{ steps.variables.outputs.test_report_path }}
-        btest_report_path: ${{ steps.variables.outputs.btest_report_path }}
-        test_all_enabled: ${{ steps.global.outputs.test_all_enabled }}
-        btest_enabled: ${{ steps.global.outputs.btest_enabled }}
-        test_all_session_file: ${{ steps.global.outputs.test_all_session_file }}
-        btest_session_file: ${{ steps.global.outputs.btest_session_file }}
diff --git a/.github/actions/setup/directories/action.yml b/.github/actions/setup/directories/action.yml
deleted file mode 100644
index 6cc66407a3..0000000000
--- a/.github/actions/setup/directories/action.yml
+++ /dev/null
@@ -1,178 +0,0 @@
-name: Setup directories etc.
-description: >-
-  Set up the source code and build directories (plus some
-  environmental tweaks)
-
-inputs:
-  srcdir:
-    required: false
-    default: ${{ github.workspace }}
-    description: >-
-      Directory to (re-)checkout source codes.  This will be created
-      if absent.  If there is no `configure` file that is also
-      generated inside.
-
-  builddir:
-    required: false
-    default: ${{ github.workspace }}
-    description: >-
-      Where binaries and other generated contents go.  This will be
-      created if absent.
-
-  makeup:
-    required: false
-    type: boolean
-    # Note that `default: false` evaluates to a string constant
-    # `'false'`, which is a truthy value :sigh:
-    # https://github.com/actions/runner/issues/2238
-    default: ''
-    description: >-
-      If set to true, additionally runs `make up`.
-
-  checkout:
-    required: false
-    type: boolean
-    default: true
-    description: >-
-      If set to '' (false), skip running actions/checkout. This is useful when
-      you don't want to overwrite a GitHub token that is already set up.
-
-  dummy-files:
-    required: false
-    type: boolean
-    default: ''
-    description: >-
-      If set to true, creates dummy files in build dir.
-
-  fetch-depth:
-    required: false
-    default: '1'
-    description: The depth of commit history fetched from the remote repository
-
-  clean:
-    required: false
-    type: boolean
-    default: ''
-    description: >-
-      If set to true, clean build directory.
-
-outputs: {} # nothing?
-
-runs:
-  using: composite
-
-  steps:
-    # Note that `shell: bash` works on both Windows and Linux, but not
-    # `shell: sh`.  This is because GitHub hosted Windows runners have
-    # their bash manually installed.
-    - shell: bash
-      run: |
-        mkdir -p ${{ inputs.srcdir }}
-        mkdir -p ${{ inputs.builddir }}
-
-    # Did you know that actions/checkout works without git(1)?  We are
-    # checking that here.
-    - id: which
-      shell: bash
-      run: |
-        echo "git=`command -v git`" >> "$GITHUB_OUTPUT"
-        echo "sudo=`command -v sudo`" >> "$GITHUB_OUTPUT"
-        echo "autoreconf=`command -v autoreconf`" >> "$GITHUB_OUTPUT"
-
-    - if: steps.which.outputs.git
-      shell: bash
-      run: |
-        git config --global core.autocrlf false
-        git config --global core.eol lf
-        git config --global advice.detachedHead 0
-        git config --global init.defaultBranch garbage
-
-    - if: inputs.checkout
-      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
-      with:
-        path: ${{ inputs.srcdir }}
-        fetch-depth: ${{ inputs.fetch-depth }}
-
-    - uses: actions/cache@1bd1e32a3bdc45362d1e726936510720a7c30a57 # v4.2.0
-      with:
-        path: ${{ inputs.srcdir }}/.downloaded-cache
-        key: downloaded-cache
-
-    - if: steps.which.outputs.autoreconf
-      shell: bash
-      working-directory: ${{ inputs.srcdir }}
-      run: ./autogen.sh --install
-
-    # This is for MinGW.
-    - if: runner.os == 'Windows'
-      shell: bash
-      run: echo "GNUMAKEFLAGS=-j$((2 * NUMBER_OF_PROCESSORS))" >> $GITHUB_ENV
-
-    - if: runner.os == 'Linux'
-      shell: bash
-      run: echo "GNUMAKEFLAGS=-sj$((1 + $(nproc --all)))" >> "$GITHUB_ENV"
-
-    # macOS' GNU make is so old that they doesn't understand `GNUMAKEFLAGS`.
-    - if: runner.os == 'macOS'
-      shell: bash
-      run: echo "MAKEFLAGS=-j$((1 + $(sysctl -n hw.activecpu)))" >> "$GITHUB_ENV"
-
-    - if: inputs.makeup
-      shell: bash
-      working-directory: ${{ inputs.srcdir }}
-      run: |
-        touch config.status .rbconfig.time
-        for mk in Makefile GNUmakefile; do
-          sed -f tool/prereq.status template/$mk.in > $mk
-        done
-        make up
-
-    # Cleanup, runs even on failure
-    - if: always() && inputs.makeup
-      shell: bash
-      working-directory: ${{ inputs.srcdir }}
-      run: |
-        rm -f config.status .rbconfig.time \
-          Makefile GNUmakefile uncommon.mk enc.mk noarch-fake.rb
-
-    - if: steps.which.outputs.sudo
-      shell: bash
-      run: |
-        sudo chmod -R go-w /usr/share
-        chmod -v go-w $HOME $HOME/.config || :
-        SAVE_IFS="$IFS" IFS=:; set $PATH; dirs=() IFS="$SAVE_IFS"
-        for d do [ ! -d "$d" ] || dirs+=("$d"); done
-        sudo chmod -v go-w "${dirs[@]}" || :
-
-    - if: inputs.dummy-files == 'true'
-      shell: bash
-      id: dummy-files
-      working-directory: ${{ inputs.builddir }}
-      run: |
-        : Create dummy files in build dir
-        set {{a..z},{A..Z},{0..9},foo,bar,test,zzz}.rb
-        for file; do \
-          echo > $file "raise 'do not load $file'"; \
-        done
-        # drop {a..z}.rb if case-insensitive filesystem
-        grep -F A.rb a.rb > /dev/null && set "${@:27}"
-        echo clean="cd ${{ inputs.builddir }} && rm $*" >> $GITHUB_OUTPUT
-
-    - if: inputs.clean == 'true'
-      shell: bash
-      id: clean
-      run: |
-        echo distclean='make -C ${{ inputs.builddir }} distclean' >> $GITHUB_OUTPUT
-        echo remained-files='find ${{ inputs.builddir }} -ls' >> $GITHUB_OUTPUT
-        [ "${{ inputs.builddir }}" = "${{ inputs.srcdir }}" ] ||
-        echo final='rmdir ${{ inputs.builddir }}' >> $GITHUB_OUTPUT
-
-    - name: clean
-      uses: gacts/run-and-post-run@4683764dd706df847f57b9bed39d08164bcd2690 # v1.4.1
-      with:
-        working-directory:
-        post: |
-          ${{ steps.dummy-files.outputs.clean }}
-          ${{ steps.clean.outputs.distclean }}
-          ${{ steps.clean.outputs.remained-files }}
-          ${{ steps.clean.outputs.final }}
diff --git a/.github/actions/setup/macos/action.yml b/.github/actions/setup/macos/action.yml
deleted file mode 100644
index 5da7c6d44c..0000000000
--- a/.github/actions/setup/macos/action.yml
+++ /dev/null
@@ -1,29 +0,0 @@
-name: Setup macOS environment
-description: >-
-  Installs necessary packages via Homebrew.
-
-inputs: {} # nothing?
-
-outputs: {} # nothing?
-
-runs:
-  using: composite
-
-  steps:
-    - name: brew
-      shell: bash
-      run: |
-        brew install --quiet jemalloc gmp libffi openssl@3 zlib autoconf automake libtool
-
-    - name: Set ENV
-      shell: bash
-      run: |
-        dir_config() {
-          local args=() lib var="$1"; shift
-          for lib in "$@"; do
-            args+="--with-${lib%@*}-dir=$(brew --prefix $lib)"
-          done
-          echo "$var=${args[*]}" >> $GITHUB_ENV
-        }
-        dir_config ruby_configure_args gmp
-        dir_config CONFIGURE_ARGS openssl@3
diff --git a/.github/actions/setup/ubuntu/action.yml b/.github/actions/setup/ubuntu/action.yml
deleted file mode 100644
index a9e5b41951..0000000000
--- a/.github/actions/setup/ubuntu/action.yml
+++ /dev/null
@@ -1,53 +0,0 @@
-name: Setup ubuntu environment
-description: >-
-  At the beginning there was no way but to copy & paste `apt-get`
-  everywhere.  But now that we have composite actions, it seems better
-  merge them into one.
-
-inputs:
-  arch:
-    required: false
-    default: ''
-    description: >-
-      Architecture.  Because we run this on a GitHub-hosted runner
-      acceptable value for this input is very limited.
-
-outputs:
-  arch:
-    value: ${{ steps.uname.outputs.uname }}
-    description: >-
-      Actual architecture.  This could be different from the one
-      passed to the `inputs.arch`.  For instance giving `i386` to this
-      action yields `i686`.
-
-runs:
-  using: composite
-
-  steps:
-    - name: set SETARCH
-      shell: bash
-      run: echo "SETARCH=${setarch}" >> "$GITHUB_ENV"
-      env:
-        setarch: ${{ inputs.arch && format('setarch {0} --', inputs.arch) }}
-
-    - id: uname
-      name: uname
-      shell: bash
-      run: |
-        echo uname=`${SETARCH} uname -m` >> "$GITHUB_OUTPUT"
-        echo dpkg=`${SETARCH} uname -m | sed s/686/386/` >> "$GITHUB_OUTPUT"
-
-    - name: apt-get
-      shell: bash
-      env:
-        arch: ${{ inputs.arch && format(':{0}', steps.uname.outputs.dpkg) || '' }}
-      run: |
-        set -x
-        ${arch:+sudo dpkg --add-architecture ${arch#:}}
-        sudo apt-get update -qq || :
-        sudo apt-get install --no-install-recommends -qq -y -o=Dpkg::Use-Pty=0 \
-        ${arch:+cross}build-essential${arch/:/-} \
-        libssl-dev${arch} libyaml-dev${arch} libreadline6-dev${arch} \
-        zlib1g-dev${arch} libncurses5-dev${arch} libffi-dev${arch} \
-        autoconf ruby
-        sudo apt-get install -qq -y pkg-config${arch} || :
diff --git a/.github/actions/slack/action.yml b/.github/actions/slack/action.yml
deleted file mode 100644
index 98171efc5e..0000000000
--- a/.github/actions/slack/action.yml
+++ /dev/null
@@ -1,39 +0,0 @@
-name: Post a message to slack
-description: >-
-  We have our ruby/action-slack webhook.  However its arguments are
-  bit verbose to be listed in every workflow files.  Better merge them
-  into one.
-
-inputs:
-  SLACK_WEBHOOK_URL:
-    required: true
-    description: >-
-      The URL to post the payload.  This is an input because it tends
-      to be stored in a secrets vault and a composite action cannot
-      look into one.
-
-  label:
-    required: false
-    description: >-
-      Human-readable description of the run, something like "DEBUG=1".
-      This need not be unique among runs.
-
-outputs: {} # Nothing?
-
-runs:
-  using: composite
-
-  steps:
-    - uses: ruby/action-slack@54175162371f1f7c8eb94d7c8644ee2479fcd375 # v3.2.2
-      with:
-        payload: |
-          {
-            "ci": "GitHub Actions",
-            "env": "${{ github.workflow }}${{ inputs.label && format(' / {0}', inputs.label) }}",
-            "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
-            "commit": "${{ github.sha }}",
-            "branch": "${{ github.ref_name }}"
-          }
-      env:
-        SLACK_WEBHOOK_URL: ${{ inputs.SLACK_WEBHOOK_URL }}
-      if: ${{github.event_name == 'push' && startsWith(github.repository, 'ruby/')}}
diff --git a/.github/auto_request_review.yml b/.github/auto_request_review.yml
deleted file mode 100644
index 8726df577d..0000000000
--- a/.github/auto_request_review.yml
+++ /dev/null
@@ -1,13 +0,0 @@
-files:
-  'yjit*': [team:yjit]
-  'yjit/**/*': [team:yjit]
-  'yjit/src/cruby_bindings.inc.rs': []
-  'doc/yjit/*': [team:yjit]
-  'bootstraptest/test_yjit*': [team:yjit]
-  'test/ruby/test_yjit*': [team:yjit]
-options:
-  ignore_draft: true
-  # This currently doesn't work as intended. We want to skip reviews when only
-  # cruby_bingings.inc.rs is modified, but this skips reviews even when other
-  # yjit files are modified as well. To be enabled after fixing the behavior.
-  #last_files_match_only: true
diff --git a/.github/codeql/codeql-config.yml b/.github/codeql/codeql-config.yml
new file mode 100644
index 0000000000..7196708b21
--- /dev/null
+++ b/.github/codeql/codeql-config.yml
@@ -0,0 +1,4 @@
+name: "CodeQL config for the Ruby language"
+
+paths-ignore:
+  - '/ext/**/*/conftest.c'
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
deleted file mode 100644
index 426893be2a..0000000000
--- a/.github/dependabot.yml
+++ /dev/null
@@ -1,18 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: 'github-actions'
-    directory: '/'
-    schedule:
-      interval: 'daily'
-  - package-ecosystem: 'github-actions'
-    directory: '/.github/actions/slack'
-    schedule:
-      interval: 'daily'
-  - package-ecosystem: 'github-actions'
-    directory: '/.github/actions/setup/directories'
-    schedule:
-      interval: 'daily'
-  - package-ecosystem: 'cargo'
-    directory: '/yjit'
-    schedule:
-      interval: 'daily'
diff --git a/.github/workflows/annocheck.yml b/.github/workflows/annocheck.yml
deleted file mode 100644
index 8cc482c428..0000000000
--- a/.github/workflows/annocheck.yml
+++ /dev/null
@@ -1,112 +0,0 @@
-name: Annocheck
-
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  compile:
-    name: test-annocheck
-
-    runs-on: ubuntu-latest
-
-    container:
-      image: ghcr.io/ruby/ruby-ci-image:gcc-11
-      options: --user root
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    env:
-      CONFIGURE_TTY: never
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-      RUBY_DEBUG: ci rgengc
-      RUBY_TESTOPTS: >-
-        -q
-        --color=always
-        --tty=no
-      # FIXME: Drop skipping options
-      # https://bugs.ruby-lang.org/issues/18061
-      # https://sourceware.org/annobin/annobin.html/Test-pie.html
-      TEST_ANNOCHECK_OPTS: '--skip-pie --skip-gaps'
-
-    steps:
-      - run: id
-        working-directory:
-
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-
-      - uses: ruby/setup-ruby@a6e6f86333f0a2523ece813039b8b4be04560854 # v1.190.0
-        with:
-          ruby-version: '3.0'
-          bundler: none
-
-      # Minimal flags to pass the check.
-      # -g0 disables backtraces when SEGV.  Do not set that.
-      - name: Run configure
-        run: >
-          ../src/configure -C
-          --enable-debug-env
-          --disable-install-doc
-          --with-ext=-test-/cxxanyargs,+
-          --without-valgrind
-          --without-jemalloc
-          --without-gmp
-          --with-gcc="gcc-11 -fcf-protection -Wa,--generate-missing-build-notes=yes"
-          --enable-shared
-          debugflags=-ggdb3
-          optflags=-O2
-          LDFLAGS=-Wl,-z,now
-
-      - run: make showflags
-
-      - run: make
-
-      - run: make test-annocheck
-
-      - uses: ./.github/actions/slack
-        with:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-defaults:
-  run:
-    working-directory: build
diff --git a/.github/workflows/auto_request_review.yml b/.github/workflows/auto_request_review.yml
deleted file mode 100644
index ca27244b46..0000000000
--- a/.github/workflows/auto_request_review.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-name: Auto Request Review
-on:
-  pull_request_target:
-    types: [opened, ready_for_review, reopened]
-
-permissions:
-  contents: read
-
-jobs:
-  auto-request-review:
-    name: Auto Request Review
-    runs-on: ubuntu-latest
-    if: ${{ github.repository == 'ruby/ruby' && github.base_ref == 'master' }}
-    steps:
-      - name: Request review based on files changes and/or groups the author belongs to
-        uses: necojackarc/auto-request-review@e89da1a8cd7c8c16d9de9c6e763290b6b0e3d424 # v0.13.0
-        with:
-          # scope: public_repo
-          token: ${{ secrets.MATZBOT_GITHUB_TOKEN }}
diff --git a/.github/workflows/baseruby.yml b/.github/workflows/baseruby.yml
index 3dbf135736..bdb9011f25 100644
--- a/.github/workflows/baseruby.yml
+++ b/.github/workflows/baseruby.yml
@@ -1,77 +1,47 @@
 name: BASERUBY Check
 
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
+on: [push, pull_request]
 
 jobs:
   baseruby:
     name: BASERUBY
-
     runs-on: ubuntu-20.04
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     strategy:
       matrix:
         ruby:
-          - ruby-3.0
-          - ruby-3.1
-          - ruby-3.2
-          - ruby-3.3
+          - ruby-2.2
+#         - ruby-2.3
+#         - ruby-2.4
+#         - ruby-2.5
+#         - ruby-2.6
+          - ruby-2.7
 
     steps:
-      - uses: ruby/setup-ruby@a6e6f86333f0a2523ece813039b8b4be04560854 # v1.190.0
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler: none
-
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-
-      - uses: ./.github/actions/setup/ubuntu
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          makeup: true
-
+      - run: echo "make=make -sj$((1 + $(nproc --all)))" >> $GITHUB_ENV
+      - run: sudo apt-get install build-essential autoconf bison
+      - run: autoconf
       - run: ./configure --disable-install-doc
-
-      - run: make all
-
-      - run: make test
-
-      - uses: ./.github/actions/slack
+      - run: $make update-unicode
+      - run: $make common-srcs
+      - run: $make incs
+      - run: $make all
+      - run: $make test
+      - uses: k0kubun/action-slack@v2.0.0
         with:
-          label: ${{ matrix.ruby }}
+          payload: |
+            {
+              "ci": "GitHub Actions",
+              "env": "${{ github.workflow }} / BASERUBY @ ${{ matrix.ruby }}",
+              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
+              "commit": "${{ github.sha }}",
+              "branch": "${{ github.ref }}".split('/').reverse()[0]
+            }
+        env:
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
+        if: failure() && github.event_name == 'push'
diff --git a/.github/workflows/bundled_gems.yml b/.github/workflows/bundled_gems.yml
deleted file mode 100644
index da2c7028c2..0000000000
--- a/.github/workflows/bundled_gems.yml
+++ /dev/null
@@ -1,136 +0,0 @@
-name: bundled_gems
-
-on:
-  push:
-    branches: ['master']
-    paths:
-      - '.github/workflows/bundled_gems.yml'
-      - 'gems/bundled_gems'
-  pull_request:
-    branches: ['master']
-    paths:
-      - '.github/workflows/bundled_gems.yml'
-      - 'gems/bundled_gems'
-  merge_group:
-  schedule:
-    - cron: '45 6 * * *'
-  workflow_dispatch:
-
-permissions: # added using https://github.com/step-security/secure-workflows
-  contents: read
-
-jobs:
-  update:
-    permissions:
-      contents: write # for Git to git push
-
-    if: ${{ github.event_name != 'schedule' || github.repository == 'ruby/ruby' }}
-
-    name: update ${{ github.workflow }}
-
-    runs-on: ubuntu-latest
-
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with:
-          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_GITHUB_TOKEN || secrets.GITHUB_TOKEN }}
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          # Skip overwriting MATZBOT_GITHUB_TOKEN
-          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
-
-      - name: Set ENV
-        run: |
-          echo "TODAY=$(date +%F)" >> $GITHUB_ENV
-
-      - name: Download previous gems list
-        run: |
-          mkdir -p .downloaded-cache
-          for data in bundled_gems.json default_gems.json; do
-            ln -s .downloaded-cache/$data .
-            curl -O -R -z ./$data https://stdgems.org/$data
-          done
-
-      - name: Update bundled gems list
-        id: bundled_gems
-        run: |
-          ruby -i~ tool/update-bundled_gems.rb gems/bundled_gems >> $GITHUB_OUTPUT
-
-      - name: Update spec/bundler/support/builders.rb
-        run: |
-          #!ruby
-          rake_version = File.read("gems/bundled_gems")[/^rake\s+(\S+)/, 1]
-          print ARGF.read.sub(/^ *def rake_version\s*\K".*?"/) {rake_version.dump}
-        shell: ruby -i~ {0} spec/bundler/support/builders.rb
-
-      - name: Maintain updated gems list in NEWS
-        run: |
-          ruby tool/update-NEWS-gemlist.rb bundled
-
-      - name: Check diffs
-        id: diff
-        run: |
-          news= gems=
-          git diff --color --no-ext-diff --ignore-submodules --exit-code -- NEWS.md ||
-          news=true
-          git diff --color --no-ext-diff --ignore-submodules --exit-code -- gems/bundled_gems ||
-          gems=true
-          git add -- NEWS.md gems/bundled_gems
-          git add -- spec/bundler/support/builders.rb
-          echo news=$news >> $GITHUB_OUTPUT
-          echo gems=$gems >> $GITHUB_OUTPUT
-          echo update=${news:-$gems} >> $GITHUB_OUTPUT
-
-      - name: Install libraries
-        uses: ./.github/actions/setup/ubuntu
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Build
-        run: |
-          ./autogen.sh
-          ./configure -C --disable-install-doc
-          make
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Prepare bundled gems
-        run: |
-          make -s prepare-gems
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Test bundled gems
-        run: |
-          make -s test-bundled-gems
-        timeout-minutes: 30
-        env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: 'typeprof'
-        if: ${{ steps.diff.outputs.gems }}
-
-      - name: Commit
-        run: |
-          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
-          message="Update bundled gems list"
-          if [ -z "${gems}" ]; then
-            git commit --message="${message} at ${GITHUB_SHA:0:30} [ci skip]"
-          else
-            git commit --message="${message} as of ${TODAY}"
-          fi
-          git push origin ${GITHUB_REF#refs/heads/}
-        env:
-          TODAY: ${{ steps.bundled_gems.outputs.latest_date || env.TODAY }}
-          EMAIL: svn-admin@ruby-lang.org
-          GIT_AUTHOR_NAME: git
-          GIT_COMMITTER_NAME: git
-          gems: ${{ steps.diff.outputs.gems }}
-        if: >-
-          ${{
-          github.repository == 'ruby/ruby' &&
-          !startsWith(github.event_name, 'pull') &&
-          steps.diff.outputs.update
-          }}
-
-      - uses: ./.github/actions/slack
-        with:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/check_branch.yml b/.github/workflows/check_branch.yml
new file mode 100644
index 0000000000..37cf3a9a8f
--- /dev/null
+++ b/.github/workflows/check_branch.yml
@@ -0,0 +1,22 @@
+# We bidirectionally synchronize github.com/ruby/ruby.git's master branch and
+# git.ruby-lang.org/ruby.git's master branch.
+# We can use a pull request's merge button only on the master branch.
+#
+# Therefore, we require to pass this "check_branch" on all protected branches
+# to prevent us from accidentally pushing commits to GitHub directly.
+#
+# Details: https://bugs.ruby-lang.org/issues/16094
+name: Pull Request
+on: [pull_request]
+jobs:
+  check_branch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check if branch is master
+        run: |
+          if [ "$BASE_REF" != master ]; then
+            echo "Only master branch accepts a pull request, but it's '$BASE_REF'."
+            exit 1
+          fi
+        env:
+          BASE_REF: ${{ github.base_ref }}
diff --git a/.github/workflows/check_dependencies.yml b/.github/workflows/check_dependencies.yml
index d871ef02c0..c878caddeb 100644
--- a/.github/workflows/check_dependencies.yml
+++ b/.github/workflows/check_dependencies.yml
@@ -1,63 +1,45 @@
 name: Check Dependencies
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
+on: [push, pull_request]
 jobs:
   update-deps:
-    name: Dependency checks
-
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04, macos-latest]
       fail-fast: true
-
     runs-on: ${{ matrix.os }}
-
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-
-      - uses: ./.github/actions/setup/ubuntu
-        if: ${{ contains(matrix.os, 'ubuntu') }}
-
-      - uses: ./.github/actions/setup/macos
-        if: ${{ contains(matrix.os, 'macos') }}
-
-      - uses: ./.github/actions/setup/directories
-
-      - uses: ruby/setup-ruby@a6e6f86333f0a2523ece813039b8b4be04560854 # v1.190.0
-        with:
-          ruby-version: '3.0'
-          bundler: none
-
+      - name: Install libraries
+        run: |
+          set -x
+          sudo apt-get update -q || :
+          sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev bison autoconf ruby
+        if: "contains(matrix.os, 'ubuntu')"
+      - name: Install libraries
+        run: |
+          brew upgrade
+          brew install gdbm gmp libffi openssl@1.1 zlib autoconf automake libtool readline
+        if: "contains(matrix.os, 'macos')"
+      - name: git config
+        run: |
+          git config --global advice.detachedHead 0
+      - uses: actions/checkout@v2
+      - run: autoconf
       - name: Run configure
         run: ./configure -C --disable-install-doc --disable-rubygems --with-gcc 'optflags=-O0' 'debugflags=-save-temps=obj -g'
-
       - run: make all golf
-
-      - run: ./goruby -veh
-
       - run: ruby tool/update-deps --fix
-
       - run: git diff --no-ext-diff --ignore-submodules --exit-code
-
-      - uses: ./.github/actions/slack
+      - uses: k0kubun/action-slack@v2.0.0
         with:
-          label: ${{ matrix.os }} / Dependencies need to update
+          payload: |
+            {
+              "ci": "GitHub Actions",
+              "env": "${{ matrix.os }} / Dependencies need to update",
+              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
+              "commit": "${{ github.sha }}",
+              "branch": "${{ github.ref }}".split('/').reverse()[0]
+            }
+        env:
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
+        if: failure() && github.event_name == 'push'
diff --git a/.github/workflows/check_misc.yml b/.github/workflows/check_misc.yml
index 5c6a95a05d..2f4bbc7093 100644
--- a/.github/workflows/check_misc.yml
+++ b/.github/workflows/check_misc.yml
@@ -1,140 +1,17 @@
-name: Misc
-on: [push, pull_request, merge_group]
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
+name: Miscellaneous checks
+on: [push, pull_request]
 
 jobs:
   checks:
-    name: Miscellaneous checks
-
-    permissions:
-      contents: write # for Git to git push
-
     runs-on: ubuntu-latest
-
     steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with:
-          token: ${{ (github.repository == 'ruby/ruby' && !startsWith(github.event_name, 'pull')) && secrets.MATZBOT_GITHUB_TOKEN || secrets.GITHUB_TOKEN }}
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          makeup: true
-          # Skip overwriting MATZBOT_GITHUB_TOKEN
-          checkout: '' # false (ref: https://github.com/actions/runner/issues/2238)
-
+      - uses: actions/checkout@v2
       - name: Check if C-sources are US-ASCII
         run: |
-          grep -r -n --include='*.[chyS]' --include='*.asm' $'[^\t-~]' -- . && exit 1 || :
-
-      - name: Check for trailing spaces
-        run: |
-          git grep -I -n $'[\t ]$' -- '*.rb' '*.[chy]' '*.rs' '*.yml' && exit 1 || :
-          git grep -n $'^[\t ][\t ]*$' -- '*.md' && exit 1 || :
-
-      - name: Check for bash specific substitution in configure.ac
-        run: |
-          git grep -n '\${[A-Za-z_0-9]*/' -- configure.ac && exit 1 || :
-
+          ! grep -r -n '[^	 -~]' *.[chy] include internal win32/*.[ch]
       - name: Check for header macros
         run: |
-          fail=
-          for header in ruby/*.h; do
-            git grep -l -F -e $header -e HAVE_`echo $header | tr a-z./ A-Z__` -- . > /dev/null && continue
-            fail=1
-            echo $header
-          done
-          exit $fail
+          ! for header in ruby/*.h; do \
+            git grep -l -F -e $header -e HAVE_`echo $header | tr a-z./ A-Z__` -- . > /dev/null || echo $header
+          done | grep -F .
         working-directory: include
-
-      - id: gems
-        run: true
-        if: ${{ github.ref == 'refs/heads/master' }}
-
-      - name: Download previous gems list
-        run: |
-          data=default_gems.json
-          mkdir -p .downloaded-cache
-          ln -s .downloaded-cache/$data .
-          curl -O -R -z ./$data https://stdgems.org/$data
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Make default gems list
-        run: |
-          #!ruby
-          require 'rubygems'
-          $:.unshift "lib"
-          rgver = File.foreach("lib/rubygems.rb") do |line|
-            break $1 if /^\s*VERSION\s*=\s*"([^"]+)"/ =~ line
-          end
-          gems = Dir.glob("{ext,lib}/**/*.gemspec").map do |f|
-            spec = Gem::Specification.load(f)
-            "#{spec.name} #{spec.version}"
-          end.sort
-          File.open("gems/default_gems", "w") do |f|
-            f.puts "RubyGems #{rgver}"
-            f.puts gems
-          end
-        shell: ruby --disable=gems {0}
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Maintain updated gems list in NEWS
-        run: |
-          ruby tool/update-NEWS-gemlist.rb default
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Check diffs
-        id: diff
-        run: |
-          git diff --color --no-ext-diff --ignore-submodules --exit-code NEWS.md ||
-          echo update=true >> $GITHUB_OUTPUT
-        if: ${{ steps.gems.outcome == 'success' }}
-
-      - name: Commit
-        run: |
-          git pull --ff-only origin ${GITHUB_REF#refs/heads/}
-          git commit --message="Update default gems list at ${GITHUB_SHA:0:30} [ci skip]" NEWS.md
-          git push origin ${GITHUB_REF#refs/heads/}
-        env:
-          EMAIL: svn-admin@ruby-lang.org
-          GIT_AUTHOR_NAME: git
-          GIT_COMMITTER_NAME: git
-        if: >-
-          ${{
-          github.repository == 'ruby/ruby' &&
-          !startsWith(github.event_name, 'pull') &&
-          steps.diff.outputs.update
-          }}
-
-      - name: Generate docs
-        id: docs
-        run: |
-          ruby -W0 --disable-gems -I./lib tool/rdoc-srcdir -q --op html .
-          echo htmlout=ruby-html-${GITHUB_SHA:0:10} >> $GITHUB_OUTPUT
-        # Generate only when document commit/PR
-        if: >-
-          ${{false
-          || contains(github.event.head_commit.message, '[ruby/rdoc]')
-          || contains(github.event.head_commit.message, '[DOC]')
-          || contains(github.event.head_commit.message, 'Document')
-          || contains(github.event.pull_request.title, '[DOC]')
-          || contains(github.event.pull_request.title, 'Document')
-          || contains(github.event.pull_request.labels.*.name, 'Documentation')
-          }}
-
-      - name: Upload docs
-        uses: actions/upload-artifact@v4
-        with:
-          path: html
-          name: ${{ steps.docs.outputs.htmlout }}
-        if: ${{ steps.docs.outcome == 'success' }}
-
-      - uses: ./.github/actions/slack
-        with:
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 6a35573faa..9fbabd35c6 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -1,121 +1,43 @@
-name: 'CodeQL'
+name: "Code scanning - action"
 
 on:
   push:
-    branches: ['master']
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
   pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
   schedule:
-    - cron: '0 12 * * *'
-  workflow_dispatch:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions: # added using https://github.com/step-security/secure-workflows
-  contents: read
+    - cron: '0 12 * * 4'
 
 jobs:
-  analyze:
-    name: Analyze
-    runs-on: ubuntu-latest
-    permissions:
-      actions: read # for github/codeql-action/init to get workflow details
-      contents: read # for actions/checkout to fetch code
-      security-events: write # for github/codeql-action/autobuild to send a status report
-    # CodeQL fails to run pull requests from dependabot due to missing write access to upload results.
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    env:
-      enable_install_doc: no
+  CodeQL-Build:
 
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - language: cpp
-          - language: ruby
+    # CodeQL runs on ubuntu-latest and windows-latest
+    runs-on: ubuntu-latest
 
     steps:
-      - name: Checkout repository
-        uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-
-      - name: Install libraries
-        if: ${{ contains(matrix.os, 'macos') }}
-        uses: ./.github/actions/setup/macos
-
-      - name: Install libraries
-        if : ${{ matrix.os == 'ubuntu-latest' }}
-        uses: ./.github/actions/setup/ubuntu
-
-      - uses: ./.github/actions/setup/directories
-
-      - name: Remove an obsolete rubygems vendored file
-        if: ${{ matrix.os == 'ubuntu-latest' }}
-        run: sudo rm /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb
-
-      - name: Initialize CodeQL
-        uses: github/codeql-action/init@babb554ede22fd5605947329c4d04d8e7a0b8155 # v3.27.7
-        with:
-          languages: ${{ matrix.language }}
-
-      - name: Autobuild
-        uses: github/codeql-action/autobuild@babb554ede22fd5605947329c4d04d8e7a0b8155 # v3.27.7
-
-      - name: Perform CodeQL Analysis
-        uses: github/codeql-action/analyze@babb554ede22fd5605947329c4d04d8e7a0b8155 # v3.27.7
-        with:
-          category: '/language:${{ matrix.language }}'
-          upload: False
-          output: sarif-results
-
-      - name: filter-sarif
-        uses: advanced-security/filter-sarif@f3b8118a9349d88f7b1c0c488476411145b6270d # v1.0.1
-        with:
-          patterns: |
-            +**/*.rb
-            -lib/uri/mailto.rb:rb/overly-large-range
-            -lib/uri/rfc3986_parser.rb:rb/overly-large-range
-            -lib/bundler/vendor/uri/lib/uri/mailto.rb:rb/overly-large-range
-            -lib/bundler/vendor/uri/lib/uri/rfc3986_parser.rb:rb/overly-large-range
-            -test/ruby/test_io.rb:rb/non-constant-kernel-open
-            -test/open-uri/test_open-uri.rb:rb/non-constant-kernel-open
-            -test/open-uri/test_ssl.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/binread_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/readlines_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/foreach_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/write_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/io/read_spec.rb:rb/non-constant-kernel-open
-            -spec/ruby/core/kernel/open_spec.rb:rb/non-constant-kernel-open
-          input: sarif-results/${{ matrix.language }}.sarif
-          output: sarif-results/${{ matrix.language }}.sarif
-        if: ${{ matrix.language == 'ruby' }}
-        continue-on-error: true
-
-      - name: Upload SARIF
-        uses: github/codeql-action/upload-sarif@babb554ede22fd5605947329c4d04d8e7a0b8155 # v3.27.7
-        with:
-          sarif_file: sarif-results/${{ matrix.language }}.sarif
-        continue-on-error: true
+    - name: Install libraries
+      run: |
+        set -x
+        sudo apt-get update -q || :
+        sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev bison autoconf ruby
+
+    - name: Checkout repository
+      uses: actions/checkout@v2
+      with:
+        fetch-depth: 2
+
+    - run: git checkout HEAD^2
+      if: ${{ github.event_name == 'pull_request' }}
+
+    - name: Remove an obsolete rubygems vendored file
+      run: sudo rm /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: cpp
+        config-file: ./.github/codeql/codeql-config.yml
+
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1
diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
index d8fcfc2638..532e4589e2 100644
--- a/.github/workflows/compilers.yml
+++ b/.github/workflows/compilers.yml
@@ -1,319 +1,215 @@
-# Some tests depending on this name 'Compilations' via $GITHUB_WORKFLOW. Make sure to update such tests when renaming this workflow.
 name: Compilations
 
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
+on: [push, pull_request]
+
+# Github actions does not support YAML anchors.  This creative use of
+# environment variables (plus the "echo ::set-env" hack) is to reroute that
+# restriction.
+env:
+  default_cc: clang-11
+  append_cc: ''
+  crosshost: ''
+
+  # -O1 is faster than -O3 in our tests... Majority of time are consumed trying
+  # to optimize binaries.  Also Github Actions runs on a relatively modern CPU
+  # compared to, say, GCC 4 or Clang 3.  We don't specify `-march=native`
+  # because compilers tend not understand what the CPU is.
+  optflags: '-O1'
+
+  # -g0 disables backtraces when SEGV.  Do not set that.
+  debugflags: '-ggdb3'
+
+  default_configure: >-
+    --enable-debug-env
+    --disable-install-doc
+    --with-ext=-test-/cxxanyargs,+
+  append_configure: >-
+    --without-valgrind
+    --without-jemalloc
+    --without-gmp
+
+  UPDATE_UNICODE: >-
+    UNICODE_FILES=.
+    UNICODE_PROPERTY_FILES=.
+    UNICODE_AUXILIARY_FILES=.
+    UNICODE_EMOJI_FILES=.
+  CONFIGURE_TTY: never
+  GITPULLOPTIONS: --no-tags origin ${{github.ref}}
+  RUBY_DEBUG: ci rgengc
+  RUBY_TESTOPTS: >-
+    -q
+    --color=always
+    --tty=no
 
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-# Each job is split so that they roughly take 30min to run through.
 jobs:
-  compile-if:
-    name: 'omnibus compilations, trigger'
+  compile:
+    strategy:
+      fail-fast: false
+      matrix:
+        entry:
+          - { key: default_cc, name: gcc-10,    value: gcc-10 }
+#         - { key: default_cc, name: gcc-9,     value: gcc-9 }
+#         - { key: default_cc, name: gcc-8,     value: gcc-8 }
+#         - { key: default_cc, name: gcc-7,     value: gcc-7 }
+#         - { key: default_cc, name: gcc-6,     value: gcc-6 }
+#         - { key: default_cc, name: gcc-5,     value: gcc-5 }
+          - { key: default_cc, name: gcc-4.8,   value: gcc-4.8 }
+          - { key: default_cc, name: clang-12,  value: clang-12 }
+#         - { key: default_cc, name: clang-11,  value: clang-11 }
+#         - { key: default_cc, name: clang-10,  value: clang-10 }
+#         - { key: default_cc, name: clang-9,   value: clang-9 }
+#         - { key: default_cc, name: clang-8,   value: clang-8 }
+#         - { key: default_cc, name: clang-7,   value: clang-7 }
+#         - { key: default_cc, name: clang-6.0, value: clang-6.0 }
+#         - { key: default_cc, name: clang-5.0, value: clang-5.0 }
+#         - { key: default_cc, name: clang-4.0, value: clang-4.0 }
+          - { key: default_cc, name: clang-3.9, value: clang-3.9 }
+
+          - { key: crosshost, name: aarch64-linux-gnu,     value: aarch64-linux-gnu }
+#         - { key: crosshost, name: arm-linux-gnueabi,     value: arm-linux-gnueabi }
+#         - { key: crosshost, name: arm-linux-gnueabihf,   value: arm-linux-gnueabihf }
+#         - { key: crosshost, name: i686-w64-mingw32,      value: i686-w64-mingw32 }
+#         - { key: crosshost, name: powerpc-linux-gnu,     value: powerpc-linux-gnu }
+          - { key: crosshost, name: powerpc64le-linux-gnu, value: powerpc64le-linux-gnu }
+          - { key: crosshost, name: s390x-linux-gnu,       value: s390x-linux-gnu }
+          - { key: crosshost, name: x86_64-w64-mingw32,    value: x86_64-w64-mingw32 }
+
+          - { key: append_cc, name: c99,   value: '-std=c99   -Werror=pedantic -pedantic-errors' }
+#         - { key: append_cc, name: c11,   value: '-std=c11   -Werror=pedantic -pedantic-errors' }
+#         - { key: append_cc, name: c17,   value: '-std=c17   -Werror=pedantic -pedantic-errors' }
+          - { key: append_cc, name: c2x,   value: '-std=c2x   -Werror=pedantic -pedantic-errors' }
+          - { key: CXXFLAGS,  name: c++98, value: '-std=c++98 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
+#         - { key: CXXFLAGS,  name: c++11, value: '-std=c++11 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
+#         - { key: CXXFLAGS,  name: c++14, value: '-std=c++14 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
+#         - { key: CXXFLAGS,  name: c++17, value: '-std=c++17 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
+          - { key: CXXFLAGS,  name: c++2a, value: '-std=c++2a -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' }
+
+          - { key: optflags, name: '-O0', value: '-O0 -march=x86-64 -mtune=generic' }
+#         - { key: optflags, name: '-O3', value: '-O3 -march=x86-64 -mtune=generic' }
+
+          - { key: append_configure, name: gmp,                  value: '--with-gmp' }
+          - { key: append_configure, name: jemalloc,             value: '--with-jemalloc' }
+          - { key: append_configure, name: valgrind,             value: '--with-valgrind' }
+          - { key: append_configure, name: 'coroutine=ucontext', value: '--with-coroutine=ucontext' }
+          - { key: append_configure, name: 'coroutine=copy',     value: '--with-coroutine=copy' }
+          - { key: append_configure, name: disable-jit-support,  value: '--disable-jit-support' }
+          - { key: append_configure, name: disable-dln,          value: '--disable-dln' }
+          - { key: append_configure, name: disable-rubygems,     value: '--disable-rubygems' }
+
+          - { key: cppflags, name: OPT_THREADED_CODE=1,            value: '-DOPT_THREADED_CODE=1' }
+          - { key: cppflags, name: OPT_THREADED_CODE=2,            value: '-DOPT_THREADED_CODE=2' }
+          - { key: cppflags, name: OPT_THREADED_CODE=3,            value: '-DOPT_THREADED_CODE=3' }
+
+          - { key: cppflags, name: NDEBUG,                         value: '-DNDEBUG' }
+          - { key: cppflags, name: RUBY_DEBUG,                     value: '-DRUBY_DEBUG' }
+#         - { key: cppflags, name: ARRAY_DEBUG,                    value: '-DARRAY_DEBUG' }
+#         - { key: cppflags, name: BIGNUM_DEBUG,                   value: '-DBIGNUM_DEBUG' }
+#         - { key: cppflags, name: CCAN_LIST_DEBUG,                value: '-DCCAN_LIST_DEBUG' }
+#         - { key: cppflags, name: CPDEBUG=-1,                     value: '-DCPDEBUG=-1' }
+#         - { key: cppflags, name: ENC_DEBUG,                      value: '-DENC_DEBUG' }
+#         - { key: cppflags, name: GC_DEBUG,                       value: '-DGC_DEBUG' }
+#         - { key: cppflags, name: HASH_DEBUG,                     value: '-DHASH_DEBUG' }
+#         - { key: cppflags, name: ID_TABLE_DEBUG,                 value: '-DID_TABLE_DEBUG' }
+#         - { key: cppflags, name: RGENGC_DEBUG=-1,                value: '-DRGENGC_DEBUG=-1' }
+#         - { key: cppflags, name: SYMBOL_DEBUG,                   value: '-DSYMBOL_DEBUG' }
+#         - { key: cppflags, name: THREAD_DEBUG=-1,                value: '-DTHREAD_DEBUG=-1' }
+
+#         - { key: cppflags, name: RGENGC_CHECK_MODE,              value: '-DRGENGC_CHECK_MODE' }
+#         - { key: cppflags, name: TRANSIENT_HEAP_CHECK_MODE,      value: '-DTRANSIENT_HEAP_CHECK_MODE' }
+#         - { key: cppflags, name: VM_CHECK_MODE,                  value: '-DVM_CHECK_MODE' }
+
+          - { key: cppflags, name: USE_EMBED_CI=0,                 value: '-DUSE_EMBED_CI=0' }
+          - { key: cppflags, name: USE_FLONUM=0,                   value: '-DUSE_FLONUM=0' }
+#         - { key: cppflags, name: USE_GC_MALLOC_OBJ_INFO_DETAILS, value: '-DUSE_GC_MALLOC_OBJ_INFO_DETAILS' }
+          - { key: cppflags, name: USE_LAZY_LOAD,                  value: '-DUSE_LAZY_LOAD' }
+#         - { key: cppflags, name: USE_RINCGC=0,                   value: '-DUSE_RINCGC=0' }
+#         - { key: cppflags, name: USE_SYMBOL_GC=0,                value: '-DUSE_SYMBOL_GC=0' }
+#         - { key: cppflags, name: USE_THREAD_CACHE=0,             value: '-DUSE_THREAD_CACHE=0' }
+#         - { key: cppflags, name: USE_TRANSIENT_HEAP=0,           value: '-DUSE_TRANSIENT_HEAP=0' }
+#         - { key: cppflags, name: USE_RUBY_DEBUG_LOG=1,           value: '-DUSE_RUBY_DEBUG_LOG=1' }
+
+          - { key: cppflags, name: DEBUG_FIND_TIME_NUMGUESS,       value: '-DDEBUG_FIND_TIME_NUMGUESS' }
+          - { key: cppflags, name: DEBUG_INTEGER_PACK,             value: '-DDEBUG_INTEGER_PACK' }
+          - { key: cppflags, name: ENABLE_PATH_CHECK,              value: '-DENABLE_PATH_CHECK' }
+
+          - { key: cppflags, name: GC_DEBUG_STRESS_TO_CLASS,       value: '-DGC_DEBUG_STRESS_TO_CLASS' }
+#         - { key: cppflags, name: GC_ENABLE_LAZY_SWEEP=0,         value: '-DGC_ENABLE_LAZY_SWEEP=0' }
+#         - { key: cppflags, name: GC_PROFILE_DETAIL_MEMOTY,       value: '-DGC_PROFILE_DETAIL_MEMOTY' }
+#         - { key: cppflags, name: GC_PROFILE_MORE_DETAIL,         value: '-DGC_PROFILE_MORE_DETAIL' }
+
+#         - { key: cppflags, name: CALC_EXACT_MALLOC_SIZE,         value: '-DCALC_EXACT_MALLOC_SIZE' }
+#         - { key: cppflags, name: MALLOC_ALLOCATED_SIZE_CHECK,    value: '-DMALLOC_ALLOCATED_SIZE_CHECK' }
+
+#         - { key: cppflags, name: IBF_ISEQ_ENABLE_LOCAL_BUFFER,   value: '-DIBF_ISEQ_ENABLE_LOCAL_BUFFER' }
+
+#         - { key: cppflags, name: RGENGC_ESTIMATE_OLDMALLOC,      value: '-DRGENGC_ESTIMATE_OLDMALLOC' }
+#         - { key: cppflags, name: RGENGC_FORCE_MAJOR_GC,          value: '-DRGENGC_FORCE_MAJOR_GC' }
+#         - { key: cppflags, name: RGENGC_OBJ_INFO,                value: '-DRGENGC_OBJ_INFO' }
+#         - { key: cppflags, name: RGENGC_OLD_NEWOBJ_CHECK,        value: '-DRGENGC_OLD_NEWOBJ_CHECK' }
+#         - { key: cppflags, name: RGENGC_PROFILE,                 value: '-DRGENGC_PROFILE' }
+
+#         - { key: cppflags, name: VM_DEBUG_BP_CHECK,              value: '-DVM_DEBUG_BP_CHECK' }
+#         - { key: cppflags, name: VM_DEBUG_VERIFY_METHOD_CACHE,   value: '-DVM_DEBUG_VERIFY_METHOD_CACHE' }
+
+          - { key: cppflags, name: MJIT_FORCE_ENABLE,              value: '-DMJIT_FORCE_ENABLE' }
+
+    name: ${{ matrix.entry.name }}
     runs-on: ubuntu-latest
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
+    container: ghcr.io/ruby/ruby-ci-image:latest
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-      - run: true
+      - run: mkdir build
         working-directory:
-
-  compile1:
-    name: 'omnibus compilations, #1'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      # Set fetch-depth: 10 so that Launchable can receive commits information.
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - name: 'clang 18 LTO'
-        uses: './.github/actions/compilers'
+      - name: setenv
+        run: |
+          echo "${{ matrix.entry.key }}=${{ matrix.entry.value }}" >> $GITHUB_ENV
+          echo "make=make -sj$((1 + $(nproc --all)))" >> $GITHUB_ENV
+      - uses: actions/checkout@v2
         with:
-          tag: clang-18
-          with_gcc: 'clang-18 -flto=auto'
-          optflags: '-O2'
-          enable_shared: false
-      - { uses: './.github/actions/compilers', name: '-O0', with: { optflags: '-O0 -march=x86-64 -mtune=generic' } }
-      # - { uses: './.github/actions/compilers', name: '-O3', with: { optflags: '-O3 -march=x86-64 -mtune=generic', check: true } }
-
-  compile2:
-    name: 'omnibus compilations, #2'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - name: 'GCC 13 LTO'
-        uses: './.github/actions/compilers'
+          path: src
+      - run: autoconf
+        working-directory: src
+      - name: Run configure
+        run: |
+          if [ -n "${crosshost}" ]; then
+            ../src/configure -C \
+              ${default_configure} \
+              ${append_configure} \
+              --host="${crosshost}"
+          else
+            ../src/configure -C \
+              ${default_configure} \
+              ${append_configure} \
+              --with-gcc="${default_cc} ${append_cc}"
+          fi
+      - run: $make extract-extlibs
+      - run: $make incs
+      - run: $make
+      - run: $make test
+      - run: $make install
+        if: "matrix.entry.name == '-O3'"
+      - run: /usr/local/bin/gem install --no-doc timezone tzinfo
+        if: "matrix.entry.name == '-O3'"
+      - run: $make test-tool
+        if: "matrix.entry.name == '-O3'"
+      - run: $make test-all TESTS='-- ruby -ext-'
+        if: "matrix.entry.name == '-O3'"
+      - run: $make test-spec
+        if: "matrix.entry.name == '-O3'"
+
+      - uses: k0kubun/action-slack@v2.0.0
         with:
-          tag: gcc-13
-          with_gcc: 'gcc-13 -flto=auto -ffat-lto-objects -Werror=lto-type-mismatch'
-          optflags: '-O2'
-          enable_shared: false
-      - { uses: './.github/actions/compilers', name: 'ext/Setup', with: { static_exts: 'etc json/* */escape' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 14', with: { tag: 'gcc-14' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 13', with: { tag: 'gcc-13' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 12', with: { tag: 'gcc-12' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 11', with: { tag: 'gcc-11' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 10', with: { tag: 'gcc-10' } }
-      - { uses: './.github/actions/compilers', name: 'GCC 9',  with: { tag: 'gcc-9'  } }
-      - { uses: './.github/actions/compilers', name: 'GCC 8',  with: { tag: 'gcc-8'  } }
-      - { uses: './.github/actions/compilers', name: 'GCC 7',  with: { tag: 'gcc-7'  } }
-
-  compile3:
-    name: 'omnibus compilations, #3'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'clang 20', with: { tag: 'clang-20' } }
-      - { uses: './.github/actions/compilers', name: 'clang 19', with: { tag: 'clang-19' } }
-      - { uses: './.github/actions/compilers', name: 'clang 18', with: { tag: 'clang-18' } }
-      - { uses: './.github/actions/compilers', name: 'clang 17', with: { tag: 'clang-17' } }
-      - { uses: './.github/actions/compilers', name: 'clang 16', with: { tag: 'clang-16' } }
-      - { uses: './.github/actions/compilers', name: 'clang 15', with: { tag: 'clang-15' } }
-      - { uses: './.github/actions/compilers', name: 'clang 14', with: { tag: 'clang-14' } }
-
-  compile4:
-    name: 'omnibus compilations, #4'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'clang 13', with: { tag: 'clang-13' } }
-      - { uses: './.github/actions/compilers', name: 'clang 12', with: { tag: 'clang-12' } }
-      - { uses: './.github/actions/compilers', name: 'clang 11', with: { tag: 'clang-11' } }
-      - { uses: './.github/actions/compilers', name: 'clang 10', with: { tag: 'clang-10' } }
-        # llvm-objcopy<=9 doesn't have --wildcard. It compiles, but leaves Rust symbols in libyjit.o.
-      - { uses: './.github/actions/compilers', name: 'clang 9',  with: { tag: 'clang-9',   append_configure: '--disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'clang 8',  with: { tag: 'clang-8',   append_configure: '--disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'clang 7',  with: { tag: 'clang-7',   append_configure: '--disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'clang 6',  with: { tag: 'clang-6.0', append_configure: '--disable-yjit' } }
-
-  compile5:
-    name: 'omnibus compilations, #5'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      # -Wno-strict-prototypes is necessary with current clang-15 since
-      # older autoconf generate functions without prototype and -pedantic
-      # now implies strict-prototypes. Disabling the error but leaving the
-      # warning generates a lot of noise from use of ANYARGS in
-      # rb_define_method() and friends.
-      # See: https://github.com/llvm/llvm-project/commit/11da1b53d8cd3507959022cd790d5a7ad4573d94
-      - { uses: './.github/actions/compilers', name: 'C99',      with: { CFLAGS: '-std=c99 -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C11',   with: { CFLAGS:   '-std=c11   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C17',   with: { CFLAGS:   '-std=c17   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C23',   with: { CFLAGS:   '-std=c2x   -Werror=pedantic -pedantic-errors -Wno-strict-prototypes' } }
-      - { uses: './.github/actions/compilers', name: 'C++98', with: { CXXFLAGS: '-std=c++98 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++11', with: { CXXFLAGS: '-std=c++11 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++14', with: { CXXFLAGS: '-std=c++14 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++17', with: { CXXFLAGS: '-std=c++17 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-
-  compile6:
-    name: 'omnibus compilations, #6'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'C++20', with: { CXXFLAGS: '-std=c++20 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++23', with: { CXXFLAGS: '-std=c++23 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'C++26', with: { CXXFLAGS: '-std=c++26 -Werror=pedantic -pedantic-errors -Wno-c++11-long-long' } }
-      - { uses: './.github/actions/compilers', name: 'gmp',                 with: { append_configure: '--with-gmp', check: 'ruby/test_bignum.rb', mspecopt: "/github/workspace/src/spec/ruby/core/integer" } }
-      - { uses: './.github/actions/compilers', name: 'jemalloc',            with: { append_configure: '--with-jemalloc' } }
-      - { uses: './.github/actions/compilers', name: 'valgrind',            with: { append_configure: '--with-valgrind' } }
-      - { uses: './.github/actions/compilers', name: 'coroutine=ucontext',  with: { append_configure: '--with-coroutine=ucontext' } }
-      - { uses: './.github/actions/compilers', name: 'coroutine=pthread',   with: { append_configure: '--with-coroutine=pthread' } }
-
-  compile7:
-    name: 'omnibus compilations, #7'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'disable-jit',         with: { append_configure: '--disable-yjit --disable-rjit' } }
-      - { uses: './.github/actions/compilers', name: 'disable-dln',         with: { append_configure: '--disable-dln' } }
-      - { uses: './.github/actions/compilers', name: 'enable-mkmf-verbose', with: { append_configure: '--enable-mkmf-verbose' } }
-      - { uses: './.github/actions/compilers', name: 'disable-rubygems',    with: { append_configure: '--disable-rubygems' } }
-      - { uses: './.github/actions/compilers', name: 'RUBY_DEVEL',          with: { append_configure: '--enable-devel' } }
-      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=0',            with: { cppflags: '-DOPT_THREADED_CODE=0' } }
-      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=1',            with: { cppflags: '-DOPT_THREADED_CODE=1' } }
-      - { uses: './.github/actions/compilers', name: 'OPT_THREADED_CODE=2',            with: { cppflags: '-DOPT_THREADED_CODE=2' } }
-
-  compile8:
-    name: 'omnibus compilations, #8'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'NDEBUG',                         with: { cppflags: '-DNDEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'RUBY_DEBUG',                     with: { cppflags: '-DRUBY_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'ARRAY_DEBUG',                    with: { cppflags: '-DARRAY_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'BIGNUM_DEBUG',                   with: { cppflags: '-DBIGNUM_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'CCAN_LIST_DEBUG',                with: { cppflags: '-DCCAN_LIST_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'CPDEBUG=-1',                     with: { cppflags: '-DCPDEBUG=-1' } }
-      - { uses: './.github/actions/compilers', name: 'ENC_DEBUG',                      with: { cppflags: '-DENC_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'GC_DEBUG',                       with: { cppflags: '-DGC_DEBUG' } }
-
-  compile9:
-    name: 'omnibus compilations, #9'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'HASH_DEBUG',                     with: { cppflags: '-DHASH_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'ID_TABLE_DEBUG',                 with: { cppflags: '-DID_TABLE_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_DEBUG=-1',                with: { cppflags: '-DRGENGC_DEBUG=-1' } }
-      - { uses: './.github/actions/compilers', name: 'SYMBOL_DEBUG',                   with: { cppflags: '-DSYMBOL_DEBUG' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_CHECK_MODE',              with: { cppflags: '-DRGENGC_CHECK_MODE' } }
-      - { uses: './.github/actions/compilers', name: 'VM_CHECK_MODE',                  with: { cppflags: '-DVM_CHECK_MODE' } }
-      - { uses: './.github/actions/compilers', name: 'USE_EMBED_CI=0',                 with: { cppflags: '-DUSE_EMBED_CI=0' } }
-      - { uses: './.github/actions/compilers', name: 'USE_FLONUM=0',                   with: { cppflags: '-DUSE_FLONUM=0', append_configure: '--disable-yjit' } }
-
-  compileX:
-    name: 'omnibus compilations, #10'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'USE_LAZY_LOAD',                  with: { cppflags: '-DUSE_LAZY_LOAD' } }
-      - { uses: './.github/actions/compilers', name: 'USE_SYMBOL_GC=0',                with: { cppflags: '-DUSE_SYMBOL_GC=0' } }
-      - { uses: './.github/actions/compilers', name: 'USE_THREAD_CACHE=0',             with: { cppflags: '-DUSE_THREAD_CACHE=0' } }
-      - { uses: './.github/actions/compilers', name: 'USE_RUBY_DEBUG_LOG=1',           with: { cppflags: '-DUSE_RUBY_DEBUG_LOG=1' } }
-      - { uses: './.github/actions/compilers', name: 'USE_DEBUG_COUNTER',              with: { cppflags: '-DUSE_DEBUG_COUNTER=1' } }
-      - { uses: './.github/actions/compilers', name: 'SHARABLE_MIDDLE_SUBSTRING',      with: { cppflags: '-DSHARABLE_MIDDLE_SUBSTRING=1' } }
-      - { uses: './.github/actions/compilers', name: 'DEBUG_FIND_TIME_NUMGUESS',       with: { cppflags: '-DDEBUG_FIND_TIME_NUMGUESS' } }
-      - { uses: './.github/actions/compilers', name: 'DEBUG_INTEGER_PACK',             with: { cppflags: '-DDEBUG_INTEGER_PACK' } }
-
-  compileB:
-    name: 'omnibus compilations, #11'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'GC_DEBUG_STRESS_TO_CLASS',       with: { cppflags: '-DGC_DEBUG_STRESS_TO_CLASS' } }
-      - { uses: './.github/actions/compilers', name: 'GC_ENABLE_LAZY_SWEEP=0',         with: { cppflags: '-DGC_ENABLE_LAZY_SWEEP=0' } }
-      - { uses: './.github/actions/compilers', name: 'GC_PROFILE_DETAIL_MEMORY',       with: { cppflags: '-DGC_PROFILE_DETAIL_MEMORY' } }
-      - { uses: './.github/actions/compilers', name: 'GC_PROFILE_MORE_DETAIL',         with: { cppflags: '-DGC_PROFILE_MORE_DETAIL' } }
-      - { uses: './.github/actions/compilers', name: 'MALLOC_ALLOCATED_SIZE_CHECK',    with: { cppflags: '-DMALLOC_ALLOCATED_SIZE_CHECK' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_ESTIMATE_OLDMALLOC',      with: { cppflags: '-DRGENGC_ESTIMATE_OLDMALLOC' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_OBJ_INFO',                with: { cppflags: '-DRGENGC_OBJ_INFO' } }
-      - { uses: './.github/actions/compilers', name: 'RGENGC_PROFILE',                 with: { cppflags: '-DRGENGC_PROFILE' } }
-
-  compileC:
-    name: 'omnibus compilations, #12'
-    runs-on: ubuntu-latest
-    needs: compile-if
-    if: ${{ needs.compile-if.result == 'success' }}
-    services: { docuum: { image: 'stephanmisc/docuum', options: '--init', volumes: [ '/root', '/var/run/docker.sock:/var/run/docker.sock' ] } }
-    steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-        with: { sparse-checkout-cone-mode: false, sparse-checkout: /.github }
-      - { uses: './.github/actions/setup/directories', with: { srcdir: 'src', builddir: 'build', makeup: true, fetch-depth: 10 } }
-      - { uses: './.github/actions/compilers', name: 'VM_DEBUG_BP_CHECK',              with: { cppflags: '-DVM_DEBUG_BP_CHECK' } }
-      - { uses: './.github/actions/compilers', name: 'VM_DEBUG_VERIFY_METHOD_CACHE',   with: { cppflags: '-DVM_DEBUG_VERIFY_METHOD_CACHE' } }
-      - { uses: './.github/actions/compilers', name: 'enable-yjit',                    with: { append_configure: '--enable-yjit --disable-rjit' } }
-      - { uses: './.github/actions/compilers', name: 'enable-rjit',                    with: { append_configure: '--enable-rjit --disable-yjit' } }
-      - { uses: './.github/actions/compilers', name: 'YJIT_FORCE_ENABLE',              with: { cppflags: '-DYJIT_FORCE_ENABLE' } }
-      - { uses: './.github/actions/compilers', name: 'RJIT_FORCE_ENABLE',              with: { cppflags: '-DRJIT_FORCE_ENABLE' } }
-      - { uses: './.github/actions/compilers', name: 'UNIVERSAL_PARSER',               with: { cppflags: '-DUNIVERSAL_PARSER' } }
-
-  compilemax:
-    name: 'omnibus compilations, result'
-    runs-on: ubuntu-latest
-    if: ${{ always() }}
-    needs:
-      - 'compile1'
-      - 'compile2'
-      - 'compile3'
-      - 'compile4'
-      - 'compile5'
-      - 'compile6'
-      - 'compile7'
-      - 'compile8'
-      - 'compile9'
-      - 'compileX'
-      - 'compileB'
-      - 'compileC'
-    steps:
-      - uses: ./.github/actions/slack
-        with:
-          label: 'omnibus'
+          payload: |
+            {
+              "ci": "GitHub Actions",
+              "env": "${{ github.workflow }} / ${{ matrix.entry.name }}",
+              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
+              "commit": "${{ github.sha }}",
+              "branch": "${{ github.ref }}".split('/').reverse()[0]
+            }
+        env:
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
-      - run: false
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+        if: failure() && github.event_name == 'push'
 
 defaults:
   run:
diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
deleted file mode 100644
index 3467fc0b70..0000000000
--- a/.github/workflows/cygwin.yml
+++ /dev/null
@@ -1,61 +0,0 @@
-name: Cygwin
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
-jobs:
-  make:
-    runs-on: windows-2022
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
-    steps:
-      - run: git config --global core.autocrlf input
-
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
-
-      - name: Setup Cygwin
-        uses: cygwin/cygwin-install-action@master
-        with:
-          packages: ruby gcc-core make autoconf libtool libssl-devel libyaml-devel libffi-devel zlib-devel
-
-      - name: configure
-        run: |
-          ./autogen.sh
-          ./configure --disable-install-doc
-        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
-
-      - name: make all
-        timeout-minutes: 30
-        run: make -j2 V=1
-        shell: C:\cygwin\bin\bash.EXE --noprofile --norc -e -o igncr -o pipefail {0}
diff --git a/.github/workflows/dependabot_automerge.yml b/.github/workflows/dependabot_automerge.yml
deleted file mode 100644
index 69ab5d9131..0000000000
--- a/.github/workflows/dependabot_automerge.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-# from https://github.com/gofiber/swagger/blob/main/.github/workflows/dependabot_automerge.yml
-name: Dependabot auto-merge
-on:
-  pull_request_target:
-
-jobs:
-  automerge:
-    runs-on: ubuntu-latest
-
-    if: ${{ github.event.pull_request.user.login == 'dependabot[bot]' }}
-
-    steps:
-      - name: Dependabot metadata
-        uses: dependabot/fetch-metadata@dbb049abf0d677abbd7f7eee0375145b417fdd34 # v2.2.0
-        id: metadata
-
-      - name: Wait for status checks
-        uses: lewagon/wait-on-check-action@ccfb013c15c8afb7bf2b7c028fb74dc5a068cccc # v1.3.4
-        with:
-          repo-token: ${{ secrets.MATZBOT_GITHUB_TOKEN }}
-          ref: ${{ github.event.pull_request.head.sha || github.sha }}
-          check-regexp: 'make \(check, .*\)'
-          wait-interval: 30
-
-      - name: Auto-merge for Dependabot PRs
-        if: ${{ steps.metadata.outputs.update-type == 'version-update:semver-minor' || steps.metadata.outputs.update-type == 'version-update:semver-patch' }}
-        run: gh pr merge --auto --rebase "$PR_URL"
-        env:
-          PR_URL: ${{ github.event.pull_request.html_url }}
-          GITHUB_TOKEN: ${{ secrets.MATZBOT_GITHUB_TOKEN }}
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 48990e4870..f0355258f1 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -1,196 +1,63 @@
 name: macOS
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    # Do not use paths-ignore for required status checks
-    # https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/collaborating-on-repositories-with-code-quality-features/troubleshooting-required-status-checks#handling-skipped-but-required-checks
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
-
+on: [push, pull_request]
 jobs:
   make:
+    runs-on: macos-latest
     strategy:
       matrix:
-        include:
-          - test_task: check
-            os: macos-14
-          - test_task: check
-            os: macos-14
-            configure_args: '--with-gcc=gcc-14'
-          - test_task: check
-            os: macos-14
-            configure_args: '--with-jemalloc --with-opt-dir=$(brew --prefix jemalloc)'
-          - test_task: check
-            os: macos-14
-            configure_args: '--with-gmp'
-          - test_task: test-all
-            test_opts: --repeat-count=2
-            os: macos-14
-          - test_task: test-bundler-parallel
-            os: macos-14
-          - test_task: test-bundled-gems
-            os: macos-14
-          - test_task: check
-            os: macos-15
-          - test_task: check
-            os: macos-13
+        test_task: [ "check", "test-bundler-parallel", "test-bundled-gems", "leaked-globals" ]
       fail-fast: false
-
     env:
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-
-    runs-on: ${{ matrix.os }}
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
+      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+      - run: mkdir build
+        working-directory:
+      - name: Disable Firewall
+        run: |
+          sudo /usr/libexec/ApplicationFirewall/socketfilterfw --setglobalstate off
+          sudo /usr/libexec/ApplicationFirewall/socketfilterfw --getglobalstate
+      - name: git config
+        run: |
+          git config --global advice.detachedHead 0
+      - uses: actions/checkout@v2
         with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
+          path: src
       - name: Install libraries
-        uses: ./.github/actions/setup/macos
-
-      - uses: ./.github/actions/setup/directories
-        with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          clean: true
-          dummy-files: ${{ matrix.test_task == 'check' }}
-          # Set fetch-depth: 0 so that Launchable can receive commits information.
-          fetch-depth: 10
-
-      - name: make sure that kern.coredump=1
         run: |
-          sysctl -n kern.coredump
-          sudo sysctl -w kern.coredump=1
-          sudo chmod -R +rwx /cores/
-
-      - name: Delete unused SDKs
-        # To free up disk space to not run out during the run
+          export WAITS='5 60'
+          tool/travis_retry.sh brew upgrade
+          tool/travis_retry.sh brew install gdbm gmp libffi openssl@1.1 zlib autoconf automake libtool readline
+        working-directory: src
+      - name: Set ENV
         run: |
-          sudo rm -rf ~/.dotnet
-          sudo rm -rf /Library/Android
-          sudo rm -rf /Library/Developer/CoreSimulator
-        continue-on-error: true
-
+          echo "JOBS=-j$((1 + $(sysctl -n hw.activecpu)))" >> $GITHUB_ENV
+      - run: autoconf
+        working-directory: src
       - name: Run configure
-        run: ../src/configure -C --disable-install-doc ${ruby_configure_args} ${{ matrix.configure_args }}
-
+        run: ../src/configure -C --disable-install-doc --with-openssl-dir=$(brew --prefix openssl@1.1) --with-readline-dir=$(brew --prefix readline)
+      - run: make $JOBS incs
+      - run: make $JOBS
       - run: make prepare-gems
-        if: ${{ matrix.test_task == 'test-bundled-gems' }}
-
-      - run: make
-
-      - run: |
-          make golf
-          case "${{ matrix.configure }}" in
-          *'--enable-shared'*)
-            make runnable
-            ./bin/goruby -veh
-            ;;
-          *)
-            ./goruby -veh
-            ;;
-          esac
-
-      - name: Set test options for skipped tests
-        run: |
-          set -x
-          TESTS="$(echo "${{ matrix.skipped_tests }}" | sed 's| |$$/ -n!/|g;s|^|-n!/|;s|$|$$/|')"
-          echo "TESTS=${TESTS}" >> $GITHUB_ENV
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-
-      - name: Set up Launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: ${{ matrix.os }}
-          test-opts: ${{ matrix.test_opts }}
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-        continue-on-error: true
-
-      - name: Set extra test options
-        run: |
-          echo "TESTS=$TESTS ${{ matrix.test_opts }}" >> $GITHUB_ENV
-          echo "RUBY_TEST_TIMEOUT_SCALE=10" >> $GITHUB_ENV # With --repeat-count=2, flaky test by timeout occurs frequently for some reason
-        if: matrix.test_opts
-
-      - name: make ${{ matrix.test_task }}
-        run: |
-          ulimit -c unlimited
-          make -s ${{ matrix.test_task }} ${TESTS:+TESTS="$TESTS"}
+        if: matrix.test_task == 'check'
+      - run: make $JOBS -s ${{ matrix.test_task }}
         timeout-minutes: 60
         env:
-          RUBY_TESTOPTS: '-q --tty=no'
-          TEST_BUNDLED_GEMS_ALLOW_FAILURES: 'typeprof'
-          PRECHECK_BUNDLED_GEMS: 'no'
-
-      - name: make skipped tests
-        run: |
-          make -s test-all TESTS="${TESTS//-n!\//-n/}"
-        env:
-          GNUMAKEFLAGS: ''
-          RUBY_TESTOPTS: '-v --tty=no'
-          PRECHECK_BUNDLED_GEMS: 'no'
-        if: ${{ matrix.test_task == 'check' && matrix.skipped_tests }}
-        continue-on-error: ${{ matrix.continue-on-skipped_tests || false }}
-
-      - uses: ./.github/actions/slack
+          RUBY_TESTOPTS: "-q --tty=no"
+          TEST_BUNDLED_GEMS_ALLOW_FAILURES: "rexml"
+      - uses: k0kubun/action-slack@v2.0.0
         with:
-          label: ${{ matrix.os }} / ${{ matrix.test_task }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
-
-      - name: Resolve job ID
-        id: job_id
-        uses: actions/github-script@main
+          payload: |
+            {
+              "ci": "GitHub Actions",
+              "env": "${{ github.workflow }} / ${{ matrix.test_task }}",
+              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
+              "commit": "${{ github.sha }}",
+              "branch": "${{ github.ref }}".split('/').reverse()[0]
+            }
         env:
-          matrix: ${{ toJson(matrix) }}
-        with:
-          script: |
-            const { data: workflow_run } = await github.rest.actions.listJobsForWorkflowRun({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              run_id: context.runId
-            });
-            const matrix = JSON.parse(process.env.matrix);
-            const job_name = `${context.job}${matrix ? ` (${Object.values(matrix).join(", ")})` : ""}`;
-            return workflow_run.jobs.find((job) => job.name === job_name).id;
-
-  result:
-    if: ${{ always() }}
-    name: ${{ github.workflow }} result
-    runs-on: macos-latest
-    needs: [make]
-    steps:
-      - run: exit 1
-        working-directory:
-        if: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: failure() && github.event_name == 'push'
 
 defaults:
   run:
diff --git a/.github/workflows/mingw.yml b/.github/workflows/mingw.yml
index e03a8d2838..c0366f2942 100644
--- a/.github/workflows/mingw.yml
+++ b/.github/workflows/mingw.yml
@@ -1,170 +1,141 @@
 name: MinGW
-on:
-  push:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  pull_request:
-    paths-ignore:
-      - 'doc/**'
-      - '**/man/*'
-      - '**.md'
-      - '**.rdoc'
-      - '**/.document'
-      - '.*.yml'
-  merge_group:
-
-concurrency:
-  group: ${{ github.workflow }} / ${{ startsWith(github.event_name, 'pull') && github.ref_name || github.sha }}
-  cancel-in-progress: ${{ startsWith(github.event_name, 'pull') }}
-
-permissions:
-  contents: read
+on: [push, pull_request]
 
 # Notes:
 # Actions console encoding causes issues, see test-all & test-spec steps
 #
 jobs:
   make:
-    runs-on: windows-2022
-
-    name: ${{ github.workflow }} (${{ matrix.msystem }})
-
+    runs-on: windows-2019
     env:
-      MSYSTEM: ${{ matrix.msystem }}
+      MSYSTEM: MINGW64
+      MSYSTEM_PREFIX: /mingw64
       MSYS2_ARCH: x86_64
-      CHOST: 'x86_64-w64-mingw32'
-      CFLAGS: '-march=x86-64 -mtune=generic -O3 -pipe'
-      CXXFLAGS: '-march=x86-64 -mtune=generic -O3 -pipe'
-      CPPFLAGS: '-D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048'
-      LDFLAGS: '-pipe'
-      GITPULLOPTIONS: --no-tags origin ${{ github.ref }}
-
+      CHOST: "x86_64-w64-mingw32"
+      CFLAGS:   "-march=x86-64 -mtune=generic -O3 -pipe -fstack-protector-strong"
+      CXXFLAGS: "-march=x86-64 -mtune=generic -O3 -pipe"
+      CPPFLAGS: "-D_FORTIFY_SOURCE=2 -D__USE_MINGW_ANSI_STDIO=1 -DFD_SETSIZE=2048"
+      LDFLAGS:  "-pipe -fstack-protector-strong"
+      UPDATE_UNICODE: "UNICODE_FILES=. UNICODE_PROPERTY_FILES=. UNICODE_AUXILIARY_FILES=. UNICODE_EMOJI_FILES=."
+      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
     strategy:
       matrix:
-        include:
-          # To mitigate flakiness of MinGW CI, we test only one runtime that newer MSYS2 uses.
-          # Ruby 3.2 is the first Windows Ruby to use OpenSSL 3.x
-          - msystem: 'UCRT64'
-            baseruby: '3.2'
-            test_task: 'check'
-            test-all-opts: '--name=!/TestObjSpace#test_reachable_objects_during_iteration/'
+        test_task: [ "check" ] # to make job names consistent
       fail-fast: false
-
-    if: >-
-      ${{!(false
-      || contains(github.event.head_commit.message, '[DOC]')
-      || contains(github.event.head_commit.message, 'Document')
-      || contains(github.event.pull_request.title, '[DOC]')
-      || contains(github.event.pull_request.title, 'Document')
-      || contains(github.event.pull_request.labels.*.name, 'Documentation')
-      || (github.event_name == 'push' && github.event.pull_request.user.login == 'dependabot[bot]')
-      )}}
-
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
     steps:
-      - name: Set up Ruby & MSYS2
-        uses: ruby/setup-ruby@a6e6f86333f0a2523ece813039b8b4be04560854 # v1.190.0
-        with:
-          ruby-version: ${{ matrix.baseruby }}
-
-      - name: Misc system & package info
+      - run: mkdir build
         working-directory:
+      - name: git config
         run: |
-          # show where
-          result=true
-          for e in gcc.exe ragel.exe make.exe libcrypto-3-x64.dll libssl-3-x64.dll; do
-            echo ::group::$'\033[93m'$e$'\033[m'
-            where $e || result=false
-            echo ::endgroup::
-          done
-          # show version
-          for e in gcc ragel make "openssl version"; do
-            case "$e" in *" "*) ;; *) e="$e --version";; esac
-            echo ::group::$'\033[93m'$e$'\033[m'
-            $e || result=false
-            echo ::endgroup::
-          done
-          # show packages
-          echo ::group::$'\033[93m'Packages$'\033[m'
-          pacman -Qs mingw-w64-ucrt-x86_64-* | sed -n "s,local/mingw-w64-ucrt-x86_64-,,p"
-          echo ::endgroup::
-          $result
-
-      - uses: actions/checkout@d632683dd7b4114ad314bca15554477dd762a938 # v4.2.0
+          git config --system core.autocrlf false
+          git config --system core.eol lf
+          git config --system advice.detachedHead 0
+      - uses: actions/checkout@v2
         with:
-          sparse-checkout-cone-mode: false
-          sparse-checkout: /.github
-
-      - uses: ./.github/actions/setup/directories
+          path: src
+      - name: Set up Ruby & MSYS2
+        uses: MSP-Greg/setup-ruby-pkgs@v1
         with:
-          srcdir: src
-          builddir: build
-          makeup: true
-          # Set fetch-depth: 10 so that Launchable can receive commits information.
-          fetch-depth: 10
+          ruby-version: 2.6
+          mingw: _upgrade_ gdbm gmp libffi libyaml openssl ragel readline
+          msys2: automake1.16 bison
+      - name: where check
+        run: |
+          # show where
+          Write-Host
+          $where = 'gcc.exe', 'ragel.exe', 'make.exe', 'bison.exe', 'libcrypto-1_1-x64.dll', 'libssl-1_1-x64.dll'
+          foreach ($e in $where) {
+            $rslt = where.exe $e 2>&1 | Out-String
+            if ($rslt.contains($e)) { Write-Host $rslt }
+            else { Write-Host "`nCan't find $e" }
+          }
+      - name: misc setup, autoreconf
+        run: |
+          mkdir install
+          mkdir temp
+          cd src
+          sh -c "autoreconf -fi"
+        working-directory:
 
       - name: configure
-        run: >
-          ../src/configure --disable-install-doc --prefix=/.
-          --build=$CHOST --host=$CHOST --target=$CHOST
+        run: |
+          # Actions uses UTF8, causes test failures, similar to normal OS setup
+          $PSDefaultParameterValues['*:Encoding'] = 'utf8'
+          [Console]::OutputEncoding = [System.Text.Encoding]::GetEncoding("IBM437")
+          [Console]::InputEncoding  = [System.Text.Encoding]::GetEncoding("IBM437")
+          $config_args = "--build=$env:CHOST --host=$env:CHOST --target=$env:CHOST"
+          Write-Host $config_args
+          sh -c "../src/configure --disable-install-doc --prefix=/install $config_args"
+          # Write-Host "-------------------------------------- config.log"
+          # Get-Content ./config.log | foreach {Write-Output $_}
+
+      - name: update
+        run: |
+          $jobs = [int](2 * $env:NUMBER_OF_PROCESSORS)
+          make -j $jobs incs
+
+      - name: download gems
+        run: |
+          $jobs = [int](2 * $env:NUMBER_OF_PROCESSORS)
+          make -j $jobs update-gems
 
       - name: make all
-        timeout-minutes: 30
-        run: make
+        timeout-minutes: 40
+        run: |
+          $jobs = [int](2 * $env:NUMBER_OF_PROCESSORS)
+          make -j $jobs
 
       - name: make install
-        run: make DESTDIR=../install install-nodoc
-
-      - name: Set up Launchable
-        uses: ./.github/actions/launchable/setup
-        with:
-          os: windows-2022
-          launchable-token: ${{ secrets.LAUNCHABLE_TOKEN }}
-          builddir: build
-          srcdir: src
-          test-tasks: '["test", "test-all"]'
-        continue-on-error: true
+        run: |
+          # Actions uses UTF8, causes test failures, similar to normal OS setup
+          $PSDefaultParameterValues['*:Encoding'] = 'utf8'
+          [Console]::OutputEncoding = [System.Text.Encoding]::GetEncoding("IBM437")
+          [Console]::InputEncoding  = [System.Text.Encoding]::GetEncoding("IBM437")
+          make DESTDIR=.. install-nodoc
 
       - name: test
-        timeout-minutes: 30
-        run: make test
-        shell: cmd
-        env:
-          GNUMAKEFLAGS: ''
-          RUBY_TESTOPTS: '-v --tty=no'
-        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test' }}
+        timeout-minutes: 5
+        run: |
+          make test
 
       - name: test-all
-        timeout-minutes: 45
-        shell: cmd
+        timeout-minutes: 60
         run: |
-          make ${{ StartsWith(matrix.test_task, 'test/') && matrix.test_task || 'test-all' }}
-        env:
-          RUBY_TESTOPTS: >-
-            --retry --job-status=normal --show-skip --timeout-scale=1.5
-            ${{ matrix.test-all-opts }}
-            ${{ env.TESTS }}
-          BUNDLER_VERSION:
-        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test-all' || StartsWith(matrix.test_task, 'test/') }}
+          # Actions uses UTF8, causes test failures, similar to normal OS setup
+          $PSDefaultParameterValues['*:Encoding'] = 'utf8'
+          [Console]::OutputEncoding = [System.Text.Encoding]::GetEncoding("IBM437")
+          [Console]::InputEncoding  = [System.Text.Encoding]::GetEncoding("IBM437")
+          $jobs = [int](1.5 * $env:NUMBER_OF_PROCESSORS)
+          if ($env:BUNDLER_VERSION) { Remove-Item env:\BUNDLER_VERSION }
+          make test-all TESTOPTS="-j $jobs --retry --job-status=normal --show-skip --timeout-scale=1.5"
 
       - name: test-spec
         timeout-minutes: 10
+        working-directory: src/spec/ruby
         run: |
-          make ${{ StartsWith(matrix.test_task, 'spec/') && matrix.test_task || 'test-spec' }}
-        shell: cmd
-        if: ${{ matrix.test_task == 'check' || matrix.test_task == 'test-spec' || StartsWith(matrix.test_task, 'spec/') }}
-
-      - uses: ./src/.github/actions/slack
+          $env:Path = "$pwd/../../../install/bin;$env:Path"
+          # Actions uses UTF8, causes test failures, similar to normal OS setup
+          $PSDefaultParameterValues['*:Encoding'] = 'utf8'
+          [Console]::OutputEncoding = [System.Text.Encoding]::GetEncoding("IBM437")
+          [Console]::InputEncoding  = [System.Text.Encoding]::GetEncoding("IBM437")
+          ruby -v
+          ruby ../mspec/bin/mspec -I../../tool/lib -j
+
+      - uses: k0kubun/action-slack@v2.0.0
         with:
-          label: ${{ matrix.msystem }} / ${{ matrix.test_task }}
+          payload: |
+            {
+              "ci": "GitHub Actions",
+              "env": "${{ github.workflow }} / ${{ matrix.test_task }}",
+              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
+              "commit": "${{ github.sha }}",
+              "branch": "${{ github.ref }}".split('/').reverse()[0]
+            }
+        env:
           SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
-        if: ${{ failure() }}
+        if: failure() && github.event_name == 'push'
 
 defaults:
   run:
     working-directory: build
-    shell: sh
diff --git a/.github/workflows/mjit.yml b/.github/workflows/mjit.yml
new file mode 100644
index 0000000000..68889ecf3d
--- /dev/null
+++ b/.github/workflows/mjit.yml
@@ -0,0 +1,77 @@
+name: MJIT
+on: [push, pull_request]
+jobs:
+  make:
+    strategy:
+      matrix:
+        test_task: [ "check" ] # to make job names consistent
+        jit_opts: [ "--jit", "--jit-wait" ]
+      fail-fast: false
+    runs-on: ubuntu-latest
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
+    env:
+      TESTOPTS: '-q --tty=no'
+      RUN_OPTS: '--disable-gems ${{ matrix.jit_opts }} --jit-debug=-ggdb3'
+      GITPULLOPTIONS: --no-tags origin ${{github.ref}}
+    steps:
+      - run: mkdir build
+        working-directory:
+      - name: Install libraries
+        run: |
+          set -x
+          sudo apt-get update -q || :
+          sudo apt-get install --no-install-recommends -q -y build-essential libssl-dev libyaml-dev libreadline6-dev zlib1g-dev libncurses5-dev libffi-dev libgdbm-dev bison autoconf ruby
+      - name: git config
+        run: |
+          git config --global advice.detachedHead 0
+      - uses: actions/checkout@v2
+        with:
+          path: src
+      - name: Fixed world writable dirs
+        run: |
+          chmod -v go-w $HOME $HOME/.config
+          sudo chmod -R go-w /usr/share
+          sudo bash -c 'IFS=:; for d in '"$PATH"'; do chmod -v go-w $d; done' || :
+      - name: Set ENV
+        run: |
+          echo "JOBS=-j$((1 + $(nproc --all)))" >> $GITHUB_ENV
+      - run: autoconf
+        working-directory: src
+      - name: Run configure
+        run: ../src/configure -C --disable-install-doc
+      - run: make $JOBS incs
+      - run: make $JOBS
+      - run: sudo make $JOBS -s install
+      - run: sudo apt-get install gdb # used by test / test-all failure
+      - name: Run test
+        run: |
+          ulimit -c unlimited
+          make $JOBS -s test RUN_OPTS="$RUN_OPTS"
+        timeout-minutes: 60
+      - name: Run test-all
+        run: |
+          ulimit -c unlimited
+          make $JOBS -s test-all RUN_OPTS="$RUN_OPTS"
+        timeout-minutes: 60
+      - name: Run test-spec
+        run: |
+          ulimit -c unlimited
+          make $JOBS -s test-spec RUN_OPTS="$RUN_OPTS"
+        timeout-minutes: 60
+      - uses: k0kubun/action-slack@v2.0.0
+        with:
+          payload: |
+            {
+              "ci": "GitHub Actions",
+              "env": "${{ github.workflow }} / ${{ matrix.test_task }} ${{ matrix.jit_opts }}",
+              "url": "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}",
+              "commit": "${{ github.sha }}",
+              "branch": "${{ github.ref }}".split('/').reverse()[0]
+            }
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SIMPLER_ALERTS_URL }} # ruby-lang slack: ruby/simpler-alerts-bot
+        if: failure() && github.event_name == 'push'
+
+defaults:
+  run:
+    working-directory: build
diff --git a/.github/workflows/modgc.yml b/.github/workflows/modgc.yml
deleted file mode 100644