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authorKazuhiro NISHIYAMA <zn@mbf.nifty.com>2020-12-25 17:31:48 +0900
committerKazuhiro NISHIYAMA <zn@mbf.nifty.com>2020-12-25 17:31:48 +0900
commit7e3d710a22049b8d5c8ced71a136b8807b2e99e7 (patch)
tree1a9c2dd2b6e25faaa7af9bc5544c2bf647aef2dd /doc
parentc591ab11ce3b74a364c4c4b2003626033daf0757 (diff)
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+# NEWS for Ruby 3.0.0
+
+This document is a list of user visible feature changes
+since the **2.7.0** release, except for bug fixes.
+
+Note that each entry is kept so brief that no reason behind or reference
+information is supplied with. For a full list of changes with all
+sufficient information, see the ChangeLog file or Redmine
+(e.g. `https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER`).
+
+## Language changes
+
+* Keyword arguments are now separated from positional arguments.
+ Code that resulted in deprecation warnings in Ruby 2.7 will now
+ result in ArgumentError or different behavior. [[Feature #14183]]
+
+* Procs accepting a single rest argument and keywords are no longer
+ subject to autosplatting. This now matches the behavior of Procs
+ accepting a single rest argument and no keywords.
+ [[Feature #16166]]
+
+ ```ruby
+ pr = proc{|*a, **kw| [a, kw]}
+
+ pr.call([1])
+ # 2.7 => [[1], {}]
+ # 3.0 => [[[1]], {}]
+
+ pr.call([1, {a: 1}])
+ # 2.7 => [[1], {:a=>1}] # and deprecation warning
+ # 3.0 => [[[1, {:a=>1}]], {}]
+ ```
+
+* Arguments forwarding (`...`) now supports leading arguments.
+ [[Feature #16378]]
+
+ ```ruby
+ def method_missing(meth, ...)
+ send(:"do_#{meth}", ...)
+ end
+ ```
+
+* Pattern matching (`case/in`) is no longer experimental. [[Feature #17260]]
+
+* One-line pattern matching is redesigned. [EXPERIMENTAL]
+
+ * `=>` is added. It can be used like a rightward assignment.
+ [[Feature #17260]]
+
+ ```ruby
+ 0 => a
+ p a #=> 0
+
+ {b: 0, c: 1} => {b:}
+ p b #=> 0
+ ```
+
+ * `in` is changed to return `true` or `false`. [[Feature #17371]]
+
+ ```ruby
+ # version 3.0
+ 0 in 1 #=> false
+
+ # version 2.7
+ 0 in 1 #=> raise NoMatchingPatternError
+ ```
+
+* Find-pattern is added. [EXPERIMENTAL]
+ [[Feature #16828]]
+
+ ```ruby
+ case ["a", 1, "b", "c", 2, "d", "e", "f", 3]
+ in [*pre, String => x, String => y, *post]
+ p pre #=> ["a", 1]
+ p x #=> "b"
+ p y #=> "c"
+ p post #=> [2, "d", "e", "f", 3]
+ end
+ ```
+
+* Endless method definition is added. [EXPERIMENTAL]
+ [[Feature #16746]]
+
+ ```ruby
+ def square(x) = x * x
+ ```
+
+* Interpolated String literals are no longer frozen when
+ `# frozen-string-literal: true` is used. [[Feature #17104]]
+
+* Magic comment `shareable_constant_value` added to freeze constants.
+ See {Magic Comments}[rdoc-ref:doc/syntax/comments.rdoc@Magic+Comments] for more details.
+ [[Feature #17273]]
+
+* A {static analysis}[rdoc-label:label-Static+analysis] foundation is
+ introduced.
+ * {RBS}[rdoc-label:label-RBS] is introduced. It is a type definition
+ language for Ruby programs.
+ * {TypeProf}[rdoc-label:label-TypeProf] is experimentally bundled. It is a
+ type analysis tool for Ruby programs.
+
+* Deprecation warnings are no longer shown by default (since Ruby 2.7.2).
+ Turn them on with `-W:deprecated` (or with `-w` to show other warnings too).
+ [[Feature #16345]]
+
+* $SAFE and $KCODE are now normal global variables with no special behavior.
+ C-API methods related to $SAFE have been removed.
+ [[Feature #16131]] [[Feature #17136]]
+
+* yield in singleton class definitions in methods is now a SyntaxError
+ instead of a warning. yield in a class definition outside of a method
+ is now a SyntaxError instead of a LocalJumpError. [[Feature #15575]]
+
+* When a class variable is overtaken by the same definition in an
+ ancestor class/module, a RuntimeError is now raised (previously,
+ it only issued a warning in verbose mode). Additionally, accessing a
+ class variable from the toplevel scope is now a RuntimeError.
+ [[Bug #14541]]
+
+* Assigning to a numbered parameter is now a SyntaxError instead of
+ a warning.
+
+## Command line options
+
+### `--help` option
+
+When the environment variable `RUBY_PAGER` or `PAGER` is present and has
+a non-empty value, and the standard input and output are tty, the `--help`
+option shows the help message via the pager designated by the value.
+[[Feature #16754]]
+
+### `--backtrace-limit` option
+
+The `--backtrace-limit` option limits the maximum length of a backtrace.
+[[Feature #8661]]
+
+## Core classes updates
+
+Outstanding ones only.
+
+* Array
+
+ * The following methods now return Array instances instead of
+ subclass instances when called on subclass instances:
+ [[Bug #6087]]
+
+ * Array#drop
+ * Array#drop_while
+ * Array#flatten
+ * Array#slice!
+ * Array#slice / Array#[]
+ * Array#take
+ * Array#take_while
+ * Array#uniq
+ * Array#*
+
+ * Can be sliced with Enumerator::ArithmeticSequence
+
+ ```ruby
+ dirty_data = ['--', 'data1', '--', 'data2', '--', 'data3']
+ dirty_data[(1..).step(2)] # take each second element
+ # => ["data1", "data2", "data3"]
+ ```
+
+* Binding
+
+ * Binding#eval when called with one argument will use "(eval)"
+ for `__FILE__` and 1 for `__LINE__` in the evaluated code.
+ [[Bug #4352]] [[Bug #17419]]
+
+* ConditionVariable
+
+ * ConditionVariable#wait may now invoke the `block`/`unblock` scheduler
+ hooks in a non-blocking context. [[Feature #16786]]
+
+* Dir
+
+ * Dir.glob and Dir.[] now sort the results by default, and
+ accept the `sort:` keyword option. [[Feature #8709]]
+
+* ENV
+
+ * ENV.except has been added, which returns a hash excluding the
+ given keys and their values. [[Feature #15822]]
+
+ * Windows: Read ENV names and values as UTF-8 encoded Strings
+ [[Feature #12650]]
+
+* Encoding
+
+ * Added new encoding IBM720. [[Feature #16233]]
+
+ * Changed default for Encoding.default_external to UTF-8 on Windows
+ [[Feature #16604]]
+
+* Fiber
+
+ * Fiber.new(blocking: true/false) allows you to create non-blocking
+ execution contexts. [[Feature #16786]]
+
+ * Fiber#blocking? tells whether the fiber is non-blocking. [[Feature #16786]]
+
+ * Fiber#backtrace and Fiber#backtrace_locations provide per-fiber backtrace.
+ [[Feature #16815]]
+
+ * The limitation of Fiber#transfer is relaxed. [[Bug #17221]]
+
+* GC
+
+ * GC.auto_compact= and GC.auto_compact have been added to control
+ when compaction runs. Setting `auto_compact=` to true will cause
+ compaction to occur during major collections. At the moment,
+ compaction adds significant overhead to major collections, so please
+ test first! [[Feature #17176]]
+
+* Hash
+
+ * Hash#transform_keys and Hash#transform_keys! now accept a hash that maps
+ keys to new keys. [[Feature #16274]]
+
+ * Hash#except has been added, which returns a hash excluding the
+ given keys and their values. [[Feature #15822]]
+
+* IO
+
+ * IO#nonblock? now defaults to `true`. [[Feature #16786]]
+
+ * IO#wait_readable, IO#wait_writable, IO#read, IO#write and other
+ related methods (e.g. IO#puts, IO#gets) may invoke the scheduler hook
+ `#io_wait(io, events, timeout)` in a non-blocking execution context.
+ [[Feature #16786]]
+
+* Kernel
+
+ * Kernel#clone when called with the `freeze: false` keyword will call
+ `#initialize_clone` with the `freeze: false` keyword.
+ [[Bug #14266]]
+
+ * Kernel#clone when called with the `freeze: true` keyword will call
+ `#initialize_clone` with the `freeze: true` keyword, and will
+ return a frozen copy even if the receiver is unfrozen.
+ [[Feature #16175]]
+
+ * Kernel#eval when called with two arguments will use "(eval)"
+ for `__FILE__` and 1 for `__LINE__` in the evaluated code.
+ [[Bug #4352]]
+
+ * Kernel#lambda now warns if called without a literal block.
+ [[Feature #15973]]
+
+ * Kernel.sleep invokes the scheduler hook `#kernel_sleep(...)` in a
+ non-blocking execution context. [[Feature #16786]]
+
+* Module
+
+ * Module#include and Module#prepend now affect classes and modules
+ that have already included or prepended the receiver, mirroring the
+ behavior if the arguments were included in the receiver before
+ the other modules and classes included or prepended the receiver.
+ [[Feature #9573]]
+
+ ```ruby
+ class C; end
+ module M1; end
+ module M2; end
+ C.include M1
+ M1.include M2
+ p C.ancestors #=> [C, M1, M2, Object, Kernel, BasicObject]
+ ```
+
+ * Module#public, Module#protected, Module#private, Module#public_class_method,
+ Module#private_class_method, toplevel "private" and "public" methods
+ now accept single array argument with a list of method names. [[Feature #17314]]
+
+ * Module#attr_accessor, Module#attr_reader, Module#attr_writer and Module#attr
+ methods now return an array of defined method names as symbols.
+ [[Feature #17314]]
+
+ * Module#alias_method now returns the defined alias as a symbol.
+ [[Feature #17314]]
+
+* Mutex
+
+ * `Mutex` is now acquired per-`Fiber` instead of per-`Thread`. This change
+ should be compatible for essentially all usages and avoids blocking when
+ using a scheduler. [[Feature #16792]]
+
+* Proc
+
+ * Proc#== and Proc#eql? are now defined and will return true for
+ separate Proc instances if the procs were created from the same block.
+ [[Feature #14267]]
+
+* Queue / SizedQueue
+
+ * Queue#pop, SizedQueue#push and related methods may now invoke the
+ `block`/`unblock` scheduler hooks in a non-blocking context.
+ [[Feature #16786]]
+
+* Ractor
+
+ * New class added to enable parallel execution. See rdoc-ref:ractor.md for
+ more details.
+
+* Random
+
+ * `Random::DEFAULT` now refers to the `Random` class instead of being a `Random` instance,
+ so it can work with `Ractor`.
+ [[Feature #17322]]
+
+ * `Random::DEFAULT` is deprecated since its value is now confusing and it is no longer global,
+ use `Kernel.rand`/`Random.rand` directly, or create a `Random` instance with `Random.new` instead.
+ [[Feature #17351]]
+
+
+* String
+
+ * The following methods now return or yield String instances
+ instead of subclass instances when called on subclass instances:
+ [[Bug #10845]]
+
+ * String#*
+ * String#capitalize
+ * String#center
+ * String#chomp
+ * String#chop
+ * String#delete
+ * String#delete_prefix
+ * String#delete_suffix
+ * String#downcase
+ * String#dump
+ * String#each_char
+ * String#each_grapheme_cluster
+ * String#each_line
+ * String#gsub
+ * String#ljust
+ * String#lstrip
+ * String#partition
+ * String#reverse
+ * String#rjust
+ * String#rpartition
+ * String#rstrip
+ * String#scrub
+ * String#slice!
+ * String#slice / String#[]
+ * String#split
+ * String#squeeze
+ * String#strip
+ * String#sub
+ * String#succ / String#next
+ * String#swapcase
+ * String#tr
+ * String#tr_s
+ * String#upcase
+
+* Symbol
+
+ * Symbol#to_proc now returns a lambda Proc. [[Feature #16260]]
+
+ * Symbol#name has been added, which returns the name of the symbol
+ if it is named. The returned string is frozen. [[Feature #16150]]
+
+* Fiber
+
+ * Introduce Fiber.set_scheduler for intercepting blocking operations and
+ Fiber.scheduler for accessing the current scheduler. See
+ rdoc-ref:fiber.md for more details about what operations are supported and
+ how to implement the scheduler hooks. [[Feature #16786]]
+
+ * Fiber.blocking? tells whether the current execution context is
+ blocking. [[Feature #16786]]
+
+ * Thread#join invokes the scheduler hooks `block`/`unblock` in a
+ non-blocking execution context. [[Feature #16786]]
+
+* Thread
+
+ * Thread.ignore_deadlock accessor has been added for disabling the
+ default deadlock detection, allowing the use of signal handlers to
+ break deadlock. [[Bug #13768]]
+
+* Warning
+
+ * Warning#warn now supports a category keyword argument.
+ [[Feature #17122]]
+
+## Stdlib updates
+
+Outstanding ones only.
+
+* BigDecimal
+
+ * Update to BigDecimal 3.0.0
+
+ * This version is Ractor compatible.
+
+* Bundler
+
+ * Update to Bundler 2.2.3
+
+* CGI
+
+ * Update to 0.2.0
+
+ * This version is Ractor compatible.
+
+* CSV
+
+ * Update to CSV 3.1.9
+
+* Date
+
+ * Update to Date 3.1.1
+
+ * This version is Ractor compatible.
+
+* Digest
+
+ * Update to Digest 3.0.0
+
+ * This version is Ractor compatible.
+
+* Etc
+
+ * Update to Etc 1.2.0
+
+ * This version is Ractor compatible.
+
+* Fiddle
+
+ * Update to Fiddle 1.0.5
+
+* IRB
+
+ * Update to IRB 1.2.6
+
+* JSON
+
+ * Update to JSON 2.5.0
+
+ * This version is Ractor compatible.
+
+* Set
+
+ * Update to set 1.0.0
+
+ * SortedSet has been removed for dependency and performance reasons.
+
+ * Set#join is added as a shorthand for `.to_a.join`.
+
+ * Set#<=> is added.
+
+* Socket
+
+ * Add :connect_timeout to TCPSocket.new [[Feature #17187]]
+
+* Net::HTTP
+
+ * Net::HTTP#verify_hostname= and Net::HTTP#verify_hostname have been
+ added to skip hostname verification. [[Feature #16555]]
+
+ * Net::HTTP.get, Net::HTTP.get_response, and Net::HTTP.get_print
+ can take the request headers as a Hash in the second argument when the
+ first argument is a URI. [[Feature #16686]]
+
+* Net::SMTP
+
+ * Add SNI support.
+
+ * Net::SMTP.start arguments are keyword arguments.
+
+ * TLS should not check the host name by default.
+
+* OpenStruct
+
+ * Initialization is no longer lazy. [[Bug #12136]]
+
+ * Builtin methods can now be overridden safely. [[Bug #15409]]
+
+ * Implementation uses only methods ending with `!`.
+
+ * Ractor compatible.
+
+ * Improved support for YAML. [[Bug #8382]]
+
+ * Use officially discouraged. Read OpenStruct@Caveats section.
+
+* Pathname
+
+ * Ractor compatible.
+
+* Psych
+
+ * Update to Psych 3.3.0
+
+ * This version is Ractor compatible.
+
+* Reline
+
+ * Update to Reline 0.1.5
+
+* RubyGems
+
+ * Update to RubyGems 3.2.3
+
+* StringIO
+
+ * Update to StringIO 3.0.0
+
+ * This version is Ractor compatible.
+
+* StringScanner
+
+ * Update to StringScanner 3.0.0
+
+ * This version is Ractor compatible.
+
+## Compatibility issues
+
+Excluding feature bug fixes.
+
+* Regexp literals and all Range objects are frozen. [[Feature #8948]] [[Feature #16377]] [[Feature #15504]]
+
+ ```ruby
+ /foo/.frozen? #=> true
+ (42...).frozen? # => true
+ ```
+
+* EXPERIMENTAL: Hash#each consistently yields a 2-element array. [[Bug #12706]]
+
+ * Now `{ a: 1 }.each(&->(k, v) { })` raises an ArgumentError
+ due to lambda's arity check.
+
+* When writing to STDOUT redirected to a closed pipe, no broken pipe
+ error message will be shown now. [[Feature #14413]]
+
+* `TRUE`/`FALSE`/`NIL` constants are no longer defined.
+
+* Integer#zero? overrides Numeric#zero? for optimization. [[Misc #16961]]
+
+* Enumerable#grep and Enumerable#grep_v when passed a Regexp and no block no longer modify
+ Regexp.last_match. [[Bug #17030]]
+
+* Requiring 'open-uri' no longer redefines `Kernel#open`.
+ Call `URI.open` directly or `use URI#open` instead. [[Misc #15893]]
+
+* SortedSet has been removed for dependency and performance reasons.
+
+## Stdlib compatibility issues
+
+* Default gems
+
+ * The following libraries are promoted to default gems from stdlib.
+
+ * English
+ * abbrev
+ * base64
+ * drb
+ * debug
+ * erb
+ * find
+ * net-ftp
+ * net-http
+ * net-imap
+ * net-protocol
+ * open-uri
+ * optparse
+ * pp
+ * prettyprint
+ * resolv-replace
+ * resolv
+ * rinda
+ * set
+ * securerandom
+ * shellwords
+ * tempfile
+ * tmpdir
+ * time
+ * tsort
+ * un
+ * weakref
+
+ * The following extensions are promoted to default gems from stdlib.
+
+ * digest
+ * io-nonblock
+ * io-wait
+ * nkf
+ * pathname
+ * syslog
+ * win32ole
+
+* Bundled gems
+
+ * net-telnet and xmlrpc have been removed from the bundled gems.
+ If you are interested in maintaining them, please comment on
+ your plan to https://github.com/ruby/xmlrpc
+ or https://github.com/ruby/net-telnet.
+
+* SDBM has been removed from the Ruby standard library. [[Bug #8446]]
+
+ * The issues of sdbm will be handled at https://github.com/ruby/sdbm
+
+* WEBrick has been removed from the Ruby standard library. [[Feature #17303]]
+
+ * The issues of WEBrick will be handled at https://github.com/ruby/webrick
+
+## C API updates
+
+* C API functions related to $SAFE have been removed.
+ [[Feature #16131]]
+
+* C API header file `ruby/ruby.h` was split. [[GH-2991]]
+
+ This should have no impact on extension libraries,
+ but users might experience slow compilations.
+
+* Memory view interface [EXPERIMENTAL]
+
+ * The memory view interface is a C-API set to exchange a raw memory area,
+ such as a numeric array or a bitmap image, between extension libraries.
+ The extension libraries can share also the metadata of the memory area
+ that consists of the shape, the element format, and so on.
+ Using these kinds of metadata, the extension libraries can share even
+ a multidimensional array appropriately.
+ This feature is designed by referring to Python's buffer protocol.
+ [[Feature #13767]] [[Feature #14722]]
+
+* Ractor related C APIs are introduced (experimental) in "include/ruby/ractor.h".
+
+## Implementation improvements
+
+* New method cache mechanism for Ractor. [[Feature #16614]]
+
+ * Inline method caches pointed from ISeq can be accessed by multiple Ractors
+ in parallel and synchronization is needed even for method caches. However,
+ such synchronization can be overhead so introducing new inline method cache
+ mechanisms, (1) Disposable inline method cache (2) per-Class method cache
+ and (3) new invalidation mechanism. (1) can avoid per-method call
+ synchronization because it only uses atomic operations.
+ See the ticket for more details.
+
+* The number of hashes allocated when using a keyword splat in
+ a method call has been reduced to a maximum of 1, and passing
+ a keyword splat to a method that accepts specific keywords
+ does not allocate a hash.
+
+* `super` is optimized when the same type of method is called in the previous call
+ if it's not refinements or an attr reader or writer.
+
+### JIT
+
+* Performance improvements of JIT-ed code
+
+ * Microarchitectural optimizations
+
+ * Native functions shared by multiple methods are deduplicated on JIT compaction.
+
+ * Decrease code size of hot paths by some optimizations and partitioning cold paths.
+
+ * Instance variables
+
+ * Eliminate some redundant checks.
+
+ * Skip checking a class and a object multiple times in a method when possible.
+
+ * Optimize accesses in some core classes like Hash and their subclasses.
+
+ * Method inlining support for some C methods
+
+ * `Kernel`: `#class`, `#frozen?`
+
+ * `Integer`: `#-@`, `#~`, `#abs`, `#bit_length`, `#even?`, `#integer?`, `#magnitude`,
+ `#odd?`, `#ord`, `#to_i`, `#to_int`, `#zero?`
+
+ * `Struct`: reader methods for 10th or later members
+
+ * Constant references are inlined.
+
+ * Always generate appropriate code for `==`, `nil?`, and `!` calls depending on
+ a receiver class.
+
+ * Reduce the number of PC accesses on branches and method returns.
+
+ * Optimize C method calls a little.
+
+* Compilation process improvements
+
+ * It does not keep temporary files in /tmp anymore.
+
+ * Throttle GC and compaction of JIT-ed code.
+
+ * Avoid GC-ing JIT-ed code when not necessary.
+
+ * GC-ing JIT-ed code is executed in a background thread.
+
+ * Reduce the number of locks between Ruby and JIT threads.
+
+## Static analysis
+
+### RBS
+
+* RBS is a new language for type definition of Ruby programs.
+ It allows writing types of classes and modules with advanced
+ types including union types, overloading, generics, and
+ _interface types_ for duck typing.
+
+* Ruby ships with type definitions for core/stdlib classes.
+
+* `rbs` gem is bundled to load and process RBS files.
+
+### TypeProf
+
+* TypeProf is a type analysis tool for Ruby code based on abstract interpretation.
+
+ * It reads non-annotated Ruby code, tries inferring its type signature, and prints
+ the analysis result in RBS format.
+
+ * Though it supports only a subset of the Ruby language yet, we will continuously
+ improve the coverage of language features, analysis performance, and usability.
+
+```ruby
+# test.rb
+def foo(x)
+ if x > 10
+ x.to_s
+ else
+ nil
+ end
+end
+
+foo(42)
+```
+
+```
+$ typeprof test.rb
+# Classes
+class Object
+ def foo : (Integer) -> String?
+end
+```
+
+## Miscellaneous changes
+
+* Methods using `ruby2_keywords` will no longer keep empty keyword
+ splats, those are now removed just as they are for methods not
+ using `ruby2_keywords`.
+
+* When an exception is caught in the default handler, the error
+ message and backtrace are printed in order from the innermost.
+ [[Feature #8661]]
+
+* Accessing an uninitialized instance variable no longer emits a
+ warning in verbose mode. [[Feature #17055]]
+
+[Bug #4352]: https://bugs.ruby-lang.org/issues/4352
+[Bug #6087]: https://bugs.ruby-lang.org/issues/6087
+[Bug #8382]: https://bugs.ruby-lang.org/issues/8382
+[Bug #8446]: https://bugs.ruby-lang.org/issues/8446
+[Feature #8661]: https://bugs.ruby-lang.org/issues/8661
+[Feature #8709]: https://bugs.ruby-lang.org/issues/8709
+[Feature #8948]: https://bugs.ruby-lang.org/issues/8948
+[Feature #9573]: https://bugs.ruby-lang.org/issues/9573
+[Bug #10845]: https://bugs.ruby-lang.org/issues/10845
+[Bug #12136]: https://bugs.ruby-lang.org/issues/12136
+[Feature #12650]: https://bugs.ruby-lang.org/issues/12650
+[Bug #12706]: https://bugs.ruby-lang.org/issues/12706
+[Feature #13767]: https://bugs.ruby-lang.org/issues/13767
+[Bug #13768]: https://bugs.ruby-lang.org/issues/13768
+[Feature #14183]: https://bugs.ruby-lang.org/issues/14183
+[Bug #14266]: https://bugs.ruby-lang.org/issues/14266
+[Feature #14267]: https://bugs.ruby-lang.org/issues/14267
+[Feature #14413]: https://bugs.ruby-lang.org/issues/14413
+[Bug #14541]: https://bugs.ruby-lang.org/issues/14541
+[Feature #14722]: https://bugs.ruby-lang.org/issues/14722
+[Bug #15409]: https://bugs.ruby-lang.org/issues/15409
+[Feature #15504]: https://bugs.ruby-lang.org/issues/15504
+[Feature #15575]: https://bugs.ruby-lang.org/issues/15575
+[Feature #15822]: https://bugs.ruby-lang.org/issues/15822
+[Misc #15893]: https://bugs.ruby-lang.org/issues/15893
+[Feature #15921]: https://bugs.ruby-lang.org/issues/15921
+[Feature #15973]: https://bugs.ruby-lang.org/issues/15973
+[Feature #16131]: https://bugs.ruby-lang.org/issues/16131
+[Feature #16150]: https://bugs.ruby-lang.org/issues/16150
+[Feature #16166]: https://bugs.ruby-lang.org/issues/16166
+[Feature #16175]: https://bugs.ruby-lang.org/issues/16175
+[Feature #16233]: https://bugs.ruby-lang.org/issues/16233
+[Feature #16260]: https://bugs.ruby-lang.org/issues/16260
+[Feature #16274]: https://bugs.ruby-lang.org/issues/16274
+[Feature #16345]: https://bugs.ruby-lang.org/issues/16345
+[Feature #16377]: https://bugs.ruby-lang.org/issues/16377
+[Feature #16378]: https://bugs.ruby-lang.org/issues/16378
+[Feature #16555]: https://bugs.ruby-lang.org/issues/16555
+[Feature #16604]: https://bugs.ruby-lang.org/issues/16604
+[Feature #16614]: https://bugs.ruby-lang.org/issues/16614
+[Feature #16686]: https://bugs.ruby-lang.org/issues/16686
+[Feature #16746]: https://bugs.ruby-lang.org/issues/16746
+[Feature #16754]: https://bugs.ruby-lang.org/issues/16754
+[Feature #16786]: https://bugs.ruby-lang.org/issues/16786
+[Feature #16792]: https://bugs.ruby-lang.org/issues/16792
+[Feature #16815]: https://bugs.ruby-lang.org/issues/16815
+[Feature #16828]: https://bugs.ruby-lang.org/issues/16828
+[Misc #16961]: https://bugs.ruby-lang.org/issues/16961
+[Bug #17030]: https://bugs.ruby-lang.org/issues/17030
+[Feature #17055]: https://bugs.ruby-lang.org/issues/17055
+[Feature #17104]: https://bugs.ruby-lang.org/issues/17104
+[Feature #17122]: https://bugs.ruby-lang.org/issues/17122
+[Feature #17136]: https://bugs.ruby-lang.org/issues/17136
+[Feature #17176]: https://bugs.ruby-lang.org/issues/17176
+[Feature #17187]: https://bugs.ruby-lang.org/issues/17187
+[Bug #17221]: https://bugs.ruby-lang.org/issues/17221
+[Feature #17260]: https://bugs.ruby-lang.org/issues/17260
+[Feature #17273]: https://bugs.ruby-lang.org/issues/17273
+[Feature #17303]: https://bugs.ruby-lang.org/issues/17303
+[Feature #17314]: https://bugs.ruby-lang.org/issues/17314
+[Feature #17322]: https://bugs.ruby-lang.org/issues/17322
+[Feature #17351]: https://bugs.ruby-lang.org/issues/17351
+[Feature #17371]: https://bugs.ruby-lang.org/issues/17371
+[Bug #17419]: https://bugs.ruby-lang.org/issues/17419
+[GH-2991]: https://github.com/ruby/ruby/pull/2991