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authorKazuhiro NISHIYAMA <zn@mbf.nifty.com>2019-12-31 18:18:21 +0900
committerKazuhiro NISHIYAMA <zn@mbf.nifty.com>2019-12-31 18:18:21 +0900
commitdb58b4a48d7a632550d67a5c8bc4ecc37819d6c9 (patch)
tree6b5370315baf60485c1a447b737de68720df0dbf /NEWS
parent3096baec0e4c24e325885f7dcd4956e8c0421f73 (diff)
Update NEWS for Ruby 2.8.0 (tentative; to be 3.0.0)
Diffstat (limited to 'NEWS')
-rw-r--r--NEWS801
1 files changed, 2 insertions, 799 deletions
diff --git a/NEWS b/NEWS
index 4ff6cf0..15f5f14 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,6 @@
# -*- rdoc -*-
-= NEWS for Ruby 2.7.0
+= NEWS for Ruby 2.8.0 (tentative; to be 3.0.0)
This document is a list of user visible feature changes made between
releases except for bug fixes.
@@ -10,819 +10,22 @@ information is supplied with. For a full list of changes with all
sufficient information, see the ChangeLog file or Redmine
(e.g. <tt>https://bugs.ruby-lang.org/issues/$FEATURE_OR_BUG_NUMBER</tt>).
-== Changes since the 2.6.0 release
+== Changes since the 2.7.0 release
=== Language changes
-==== Pattern matching
-
-* Pattern matching is introduced as an experimental feature. [Feature #14912]
-
- case [0, [1, 2, 3]]
- in [a, [b, *c]]
- p a #=> 0
- p b #=> 1
- p c #=> [2, 3]
- end
-
- case {a: 0, b: 1}
- in {a: 0, x: 1}
- :unreachable
- in {a: 0, b: var}
- p var #=> 1
- end
-
- case -1
- in 0 then :unreachable
- in 1 then :unreachable
- end #=> NoMatchingPatternError
-
- json = <<END
- {
- "name": "Alice",
- "age": 30,
- "children": [{ "name": "Bob", "age": 2 }]
- }
- END
-
- JSON.parse(json, symbolize_names: true) in {name: "Alice", children: [{name: name, age: age}]}
-
- p name #=> "Bob"
- p age #=> 2
-
- JSON.parse(json, symbolize_names: true) in {name: "Alice", children: [{name: "Charlie", age: age}]}
- #=> NoMatchingPatternError
-
-* See the following slides for more details:
- * https://speakerdeck.com/k_tsj/pattern-matching-new-feature-in-ruby-2-dot-7
- * Note that the slides are slightly obsolete.
-
-* The warning against pattern matching can be suppressed with
- {-W:no-experimental option}[#label-Warning+option].
-
-==== The spec of keyword arguments is changed towards 3.0
-
-* Automatic conversion of keyword arguments and positional arguments is
- deprecated, and conversion will be removed in Ruby 3. [Feature #14183]
-
- * When a method call passes a Hash at the last argument, and when it
- passes no keywords, and when the called method accepts keywords,
- a warning is emitted. To continue treating the hash as keywords,
- add a double splat operator to avoid the warning and ensure
- correct behavior in Ruby 3.
-
- def foo(key: 42); end; foo({key: 42}) # warned
- def foo(**kw); end; foo({key: 42}) # warned
- def foo(key: 42); end; foo(**{key: 42}) # OK
- def foo(**kw); end; foo(**{key: 42}) # OK
-
- * When a method call passes keywords to a method that accepts keywords,
- but it does not pass enough required positional arguments, the
- keywords are treated as a final required positional argument, and a
- warning is emitted. Pass the argument as a hash instead of keywords
- to avoid the warning and ensure correct behavior in Ruby 3.
-
- def foo(h, **kw); end; foo(key: 42) # warned
- def foo(h, key: 42); end; foo(key: 42) # warned
- def foo(h, **kw); end; foo({key: 42}) # OK
- def foo(h, key: 42); end; foo({key: 42}) # OK
-
- * When a method accepts specific keywords but not a keyword splat, and
- a hash or keywords splat is passed to the method that includes both
- Symbol and non-Symbol keys, the hash will continue to be split, and
- a warning will be emitted. You will need to update the calling code
- to pass separate hashes to ensure correct behavior in Ruby 3.
-
- def foo(h={}, key: 42); end; foo("key" => 43, key: 42) # warned
- def foo(h={}, key: 42); end; foo({"key" => 43, key: 42}) # warned
- def foo(h={}, key: 42); end; foo({"key" => 43}, key: 42) # OK
-
- * If a method does not accept keywords, and is called with keywords,
- the keywords are still treated as a positional hash, with no warning.
- This behavior will continue to work in Ruby 3.
-
- def foo(opt={}); end; foo( key: 42 ) # OK
-
-* Non-symbols are allowed as keyword argument keys if the method accepts
- arbitrary keywords. [Feature #14183]
-
- * Non-Symbol keys in a keyword arguments hash were prohibited in 2.6.0,
- but are now allowed again. [Bug #15658]
-
- def foo(**kw); p kw; end; foo("str" => 1) #=> {"str"=>1}
-
-* <code>**nil</code> is allowed in method definitions to explicitly mark
- that the method accepts no keywords. Calling such a method with keywords
- will result in an ArgumentError. [Feature #14183]
-
- def foo(h, **nil); end; foo(key: 1) # ArgumentError
- def foo(h, **nil); end; foo(**{key: 1}) # ArgumentError
- def foo(h, **nil); end; foo("str" => 1) # ArgumentError
- def foo(h, **nil); end; foo({key: 1}) # OK
- def foo(h, **nil); end; foo({"str" => 1}) # OK
-
-* Passing an empty keyword splat to a method that does not accept keywords
- no longer passes an empty hash, unless the empty hash is necessary for
- a required parameter, in which case a warning will be emitted. Remove
- the double splat to continue passing a positional hash. [Feature #14183]
-
- h = {}; def foo(*a) a end; foo(**h) # []
- h = {}; def foo(a) a end; foo(**h) # {} and warning
- h = {}; def foo(*a) a end; foo(h) # [{}]
- h = {}; def foo(a) a end; foo(h) # {}
-
-* Above warnings can be suppressed also with {-W:no-deprecated option}[#label-Warning+option].
-
-==== Numbered parameters
-
-* Numbered parameters as default block parameters are introduced.
- [Feature #4475]
-
- [1, 2, 10].map { _1.to_s(16) } #=> ["1", "2", "a"]
- [[1, 2], [3, 4]].map { _1 + _2 } #=> [3, 7]
-
- You can still define a local variable named +_1+ and so on,
- and that is honored when present, but renders a warning.
-
- _1 = 0 #=> warning: `_1' is reserved for numbered parameter; consider another name
- [1].each { p _1 } # prints 0 instead of 1
-
-==== proc/lambda without block is deprecated
-
-* Proc.new and Kernel#proc with no block in a method called with a block will
- now display a warning.
-
- def foo
- proc
- end
- foo { puts "Hello" } #=> warning: Capturing the given block using Kernel#proc is deprecated; use `&block` instead
-
- This warning can be suppressed with {-W:no-deprecated option}[#label-Warning+option].
-
-* Kernel#lambda with no block in a method called with a block raises an exception.
-
- def bar
- lambda
- end
- bar { puts "Hello" } #=> tried to create Proc object without a block (ArgumentError)
-
-==== Other miscellaneous changes
-
-* A beginless range is experimentally introduced. It might be useful
- in +case+, new call-sequence of the <code>Comparable#clamp</code>,
- constants and DSLs. [Feature #14799]
-
- ary[..3] # identical to ary[0..3]
-
- case RUBY_VERSION
- when ..."2.4" then puts "EOL"
- # ...
- end
-
- age.clamp(..100)
-
- where(sales: ..100)
-
-* Setting <code>$;</code> to a non-nil value will now display a warning. [Feature #14240]
- This includes the usage in String#split.
- This warning can be suppressed with {-W:no-deprecated option}[#label-Warning+option].
-
-* Setting <code>$,</code> to a non-nil value will now display a warning. [Feature #14240]
- This include the usage in Array#join.
- This warning can be suppressed with {-W:no-deprecated option}[#label-Warning+option].
-
-* Quoted here-document identifiers must end within the same line.
-
- <<"EOS
- " # This had been warned since 2.4; Now it raises a SyntaxError
- EOS
-
-* The flip-flop syntax deprecation is reverted. [Feature #5400]
-
-* Comment lines can be placed between fluent dot now.
-
- foo
- # .bar
- .baz # => foo.baz
-
-* Calling a private method with a literal +self+ as the receiver
- is now allowed. [Feature #11297] [Feature #16123]
-
-* Modifier rescue now operates the same for multiple assignment as single
- assignment. [Bug #8279]
-
- a, b = raise rescue [1, 2]
- # Previously parsed as: (a, b = raise) rescue [1, 2]
- # Now parsed as: a, b = (raise rescue [1, 2])
-
-* +yield+ in singleton class syntax will now display a warning. This behavior
- will soon be deprecated. [Feature #15575].
-
- def foo
- class << Object.new
- yield #=> warning: `yield' in class syntax will not be supported from Ruby 3.0. [Feature #15575]
- end
- end
- foo { p :ok }
-
- This warning can be suppressed with {-W:no-deprecated option}[#label-Warning+option].
-
-* Argument forwarding by <code>(...)</code> is introduced. [Feature #16253]
-
- def foo(...)
- bar(...)
- end
-
- All arguments to +foo+ are forwarded to +bar+, including keyword and
- block arguments.
- Note that the parentheses are mandatory. <code>bar ...</code> is parsed
- as an endless range.
-
-* Access and setting of <code>$SAFE</code> will now always display a warning.
- <code>$SAFE</code> will become a normal global variable in Ruby 3.0.
- [Feature #16131]
-
-* <code>Object#{taint,untaint,trust,untrust}</code> and related functions in the C-API
- no longer have an effect (all objects are always considered untainted), and will now
- display a warning in verbose mode. This warning will be disabled even in non-verbose mode in
- Ruby 3.0, and the methods and C functions will be removed in Ruby 3.2. [Feature #16131]
-
-* Refinements take place at Object#method and Module#instance_method. [Feature #15373]
-
=== Command line options
-==== Warning option
-
-The +-W+ option has been extended with a following +:+, to manage categorized
-warnings. [Feature #16345] [Feature #16420]
-
-* To suppress deprecation warnings:
-
- $ ruby -e '$; = ""'
- -e:1: warning: `$;' is deprecated
-
- $ ruby -W:no-deprecated -e '$; = //'
-
-* It works with the +RUBYOPT+ environment variable:
-
- $ RUBYOPT=-W:no-deprecated ruby -e '$; = //'
-
-* To suppress experimental feature warnings:
-
- $ ruby -e '0 in a'
- -e:1: warning: Pattern matching is experimental, and the behavior may change in future versions of Ruby!
-
- $ ruby -W:no-experimental -e '0 in a'
-
-* To suppress both by using +RUBYOPT+, set space separated values:
-
- $ RUBYOPT='-W:no-deprecated -W:no-experimental' ruby -e '($; = "") in a'
-
-See also Warning in {Core classes updates}[#label-Core+classes+updates+-28outstanding+ones+only-29].
-
=== Core classes updates (outstanding ones only)
-Array::
-
- New methods::
-
- * Added Array#intersection. [Feature #16155]
-
- * Added Array#minmax, with a faster implementation than Enumerable#minmax. [Bug #15929]
-
-Comparable::
-
- Modified method::
-
- * Comparable#clamp now accepts a Range argument. [Feature #14784]
-
- -1.clamp(0..2) #=> 0
- 1.clamp(0..2) #=> 1
- 3.clamp(0..2) #=> 2
- # With beginless and endless ranges:
- -1.clamp(0..) #=> 0
- 3.clamp(..2) #=> 2
-
-
-Complex::
-
- New method::
-
- * Added Complex#<=>.
- So <code>0 <=> 0i</code> will not raise NoMethodError. [Bug #15857]
-
-Dir::
-
- Modified methods::
-
- * Dir.glob and Dir.[] no longer allow NUL-separated glob pattern.
- Use Array instead. [Feature #14643]
-
-Encoding::
-
- New encoding::
-
- * Added new encoding CESU-8. [Feature #15931]
-
-Enumerable::
-
- New methods::
-
- * Added Enumerable#filter_map. [Feature #15323]
-
- [1, 2, 3].filter_map {|x| x.odd? ? x.to_s : nil } #=> ["1", "3"]
-
- * Added Enumerable#tally. [Feature #11076]
-
- ["A", "B", "C", "B", "A"].tally #=> {"A"=>2, "B"=>2, "C"=>1}
-
-Enumerator::
-
- New methods::
-
- * Added Enumerator.produce to generate an Enumerator from any custom
- data transformation. [Feature #14781]
-
- require "date"
- dates = Enumerator.produce(Date.today, &:succ) #=> infinite sequence of dates
- dates.detect(&:tuesday?) #=> next Tuesday
-
- * Added Enumerator::Lazy#eager that generates a non-lazy enumerator
- from a lazy enumerator. [Feature #15901]
-
- a = %w(foo bar baz)
- e = a.lazy.map {|x| x.upcase }.map {|x| x + "!" }.eager
- p e.class #=> Enumerator
- p e.map {|x| x + "?" } #=> ["FOO!?", "BAR!?", "BAZ!?"]
-
- * Added Enumerator::Yielder#to_proc so that a Yielder object
- can be directly passed to another method as a block
- argument. [Feature #15618]
-
-Fiber::
-
- New method::
-
- * Added Fiber#raise that behaves like Fiber#resume but raises an
- exception on the resumed fiber. [Feature #10344]
-
-File::
-
- Modified method::
-
- * File.extname now returns a dot string for names ending with a dot on
- non-Windows platforms. [Bug #15267]
-
- File.extname("foo.") #=> "."
-
-FrozenError::
-
- New method::
-
- * Added FrozenError#receiver to return the frozen object on which
- modification was attempted. To set this object when raising
- FrozenError in Ruby code, FrozenError.new accepts a +:receiver+
- option. [Feature #15751]
-
-GC::
-
- New method::
-
- * Added GC.compact method for compacting the heap.
- This function compacts live objects in the heap so that fewer pages may
- be used, and the heap may be more CoW (copy-on-write) friendly. [Feature #15626]
-
- Details on the algorithm and caveats can be found here:
- https://bugs.ruby-lang.org/issues/15626
-
-IO::
-
- New method::
-
- * Added IO#set_encoding_by_bom to check the BOM and set the external
- encoding. [Bug #15210]
-
-Integer::
-
- Modified method::
-
- * Integer#[] now supports range operations. [Feature #8842]
-
- 0b01001101[2, 4] #=> 0b0011
- 0b01001100[2..5] #=> 0b0011
- 0b01001100[2...6] #=> 0b0011
- # ^^^^
-
-Method::
-
- Modified method::
-
- * Method#inspect shows more information. [Feature #14145]
-
-Module::
-
- New methods::
-
- * Added Module#const_source_location to retrieve the location where a
- constant is defined. [Feature #10771]
-
- * Added Module#ruby2_keywords for marking a method as passing keyword
- arguments through a regular argument splat, useful when delegating
- all arguments to another method in a way that can be backwards
- compatible with older Ruby versions. [Bug #16154]
-
- Modified methods::
-
- * Module#autoload? now takes an +inherit+ optional argument, like
- Module#const_defined?. [Feature #15777]
-
- * Module#name now always returns a frozen String. The returned String is
- always the same for a given Module. This change is
- experimental. [Feature #16150]
-
-NilClass / TrueClass / FalseClass::
-
- Modified methods::
-
- * NilClass#to_s, TrueClass#to_s, and FalseClass#to_s now always return a
- frozen String. The returned String is always the same for each of these
- values. This change is experimental. [Feature #16150]
-
-ObjectSpace::WeakMap::
-
- Modified method::
-
- * ObjectSpace::WeakMap#[]= now accepts special objects as either key or
- values. [Feature #16035]
-
-Proc::
-
- New method::
-
- * Added Proc#ruby2_keywords for marking the proc as passing keyword
- arguments through a regular argument splat, useful when delegating
- all arguments to another method or proc in a way that can be backwards
- compatible with older Ruby versions. [Feature #16404]
-
-Range::
-
- New method::
-
- * Added Range#minmax, with a faster implementation than Enumerable#minmax.
- It returns a maximum that now corresponds to Range#max. [Bug #15807]
-
- Modified method::
-
- * Range#=== now uses Range#cover? for String arguments, too (in Ruby 2.6, it was
- changed from Range#include? for all types except strings). [Bug #15449]
-
-
-RubyVM::
-
- Removed method::
-
- * +RubyVM.resolve_feature_path+ moved to
- <code>$LOAD_PATH.resolve_feature_path</code>. [Feature #15903] [Feature #15230]
-
-String::
-
- Unicode::
-
- * Update Unicode version and Emoji version from 11.0.0 to
- 12.0.0. [Feature #15321]
-
- * Update Unicode version to 12.1.0, adding support for
- U+32FF SQUARE ERA NAME REIWA. [Feature #15195]
-
- * Update Unicode Emoji version to 12.1. [Feature #16272]
-
-Symbol::
-
- New methods::
-
- * Added Symbol#start_with? and Symbol#end_with? methods. [Feature #16348]
-
-Time::
-
- New methods::
-
- * Added Time#ceil method. [Feature #15772]
-
- * Added Time#floor method. [Feature #15653]
-
- Modified method::
-
- * Time#inspect is separated from Time#to_s and it shows
- the time's sub second. [Feature #15958]
-
-UnboundMethod::
-
- New method::
-
- * Added UnboundMethod#bind_call method. [Feature #15955]
-
- <code>umethod.bind_call(obj, ...)</code> is semantically equivalent
- to <code>umethod.bind(obj).call(...)</code>. This idiom is used in
- some libraries to call a method that is overridden. The added
- method does the same without allocation of an intermediate Method
- object.
-
- class Foo
- def add_1(x)
- x + 1
- end
- end
- class Bar < Foo
- def add_1(x) # override
- x + 2
- end
- end
-
- obj = Bar.new
- p obj.add_1(1) #=> 3
- p Foo.instance_method(:add_1).bind(obj).call(1) #=> 2
- p Foo.instance_method(:add_1).bind_call(obj, 1) #=> 2
-
-Warning::
-
- New methods::
-
- * Added Warning.[] and Warning.[]= to manage emitting/suppressing
- some categories of warnings. [Feature #16345] [Feature #16420]
-
-$LOAD_PATH::
-
- New method::
-
- * Added <code>$LOAD_PATH.resolve_feature_path</code>. [Feature #15903] [Feature #15230]
-
=== Stdlib updates (outstanding ones only)
-Bundler::
-
- * Upgrade to Bundler 2.1.2.
- See https://github.com/bundler/bundler/releases/tag/v2.1.2
-
-CGI::
-
- * CGI.escapeHTML becomes 2~5x faster when there is at least one escaped character.
- See https://github.com/ruby/ruby/pull/2226
-
-CSV::
-
- * Upgrade to 3.1.2.
- See https://github.com/ruby/csv/blob/master/NEWS.md.
-
-Date::
-
- * Date.jisx0301, Date#jisx0301, and Date.parse support the new Japanese
- era. [Feature #15742]
-
-Delegator::
-
- * Object#DelegateClass accepts a block and module_evals it in the context
- of the returned class, similar to Class.new and Struct.new.
-
-ERB::
-
- * Prohibit marshaling ERB instance.
-
-IRB::
-
- * Introduce syntax highlighting inspired by the Pry gem to Binding#irb
- source lines, REPL input, and inspect output of some core-class objects.
-
- * Introduce multiline editing mode provided by Reline.
-
- * Show documentation when completion.
-
- * Enable auto indent and save/load history by default.
-
-JSON::
-
- * Upgrade to 2.3.0.
-
-Net::FTP::
-
- * Add Net::FTP#features to check available features, and Net::FTP#option to
- enable/disable each of them. [Feature #15964]
-
-Net::HTTP::
-
- * Add +ipaddr+ optional parameter to Net::HTTP#start to replace the address for
- the TCP/IP connection. [Feature #5180]
-
-Net::IMAP::
-
- * Add Server Name Indication (SNI) support. [Feature #15594]
-
-open-uri::
-
- * Warn open-uri's "open" method at Kernel.
- Use URI.open instead. [Misc #15893]
-
- * The default charset of "text/*" media type is UTF-8 instead of
- ISO-8859-1. [Bug #15933]
-
-OptionParser::
-
- * Now show "Did you mean?" for unknown options. [Feature #16256]
-
- test.rb:
-
- require "optparse"
- OptionParser.new do |opts|
- opts.on("-f", "--foo", "foo") {|v| }
- opts.on("-b", "--bar", "bar") {|v| }
- opts.on("-c", "--baz", "baz") {|v| }
- end.parse!
-
- example:
-
- $ ruby test.rb --baa
- Traceback (most recent call last):
- test.rb:7:in `<main>': invalid option: --baa (OptionParser::InvalidOption)
- Did you mean? baz
- bar
-
-Pathname::
-
- * Pathname.glob now delegates 3 arguments to Dir.glob
- to accept +base+ keyword. [Feature #14405]
-
-Racc::
-
- * Merge 1.4.15 from upstream repository and added cli of racc.
-
-Reline::
-
- * New stdlib that is compatible with the readline stdlib but is
- implemented in pure Ruby. It also provides a multiline editing mode.
-
-REXML::
-
- * Upgrade to 3.2.3.
- See https://github.com/ruby/rexml/blob/master/NEWS.md.
-
-RSS::
-
- * Upgrade to RSS 0.2.8.
- See https://github.com/ruby/rss/blob/master/NEWS.md.
-
-RubyGems::
-
- * Upgrade to RubyGems 3.1.2.
- * https://github.com/rubygems/rubygems/releases/tag/v3.1.0
- * https://github.com/rubygems/rubygems/releases/tag/v3.1.1
- * https://github.com/rubygems/rubygems/releases/tag/v3.1.2
-
-StringScanner::
-
- * Upgrade to 1.0.3.
- See https://github.com/ruby/strscan/blob/master/NEWS.md.
-
=== Compatibility issues (excluding feature bug fixes)
-* The following libraries are no longer bundled gems.
- Install corresponding gems to use these features.
- * CMath (cmath gem)
- * Scanf (scanf gem)
- * Shell (shell gem)
- * Synchronizer (sync gem)
- * ThreadsWait (thwait gem)
- * E2MM (e2mmap gem)
-
-Proc::
- * The Proc#to_s format was changed. [Feature #16101]
-
-Range::
- * Range#minmax used to iterate on the range to determine the maximum.
- It now uses the same algorithm as Range#max. In rare cases (e.g.
- ranges of Floats or Strings), this may yield different results. [Bug #15807]
-
=== Stdlib compatibility issues (excluding feature bug fixes)
-* Promote stdlib to default gems
- * The following default gems were published on rubygems.org
- * benchmark
- * cgi
- * delegate
- * getoptlong
- * net-pop
- * net-smtp
- * open3
- * pstore
- * readline
- * readline-ext
- * singleton
- * The following default gems were only promoted at ruby-core,
- but not yet published on rubygems.org.
- * monitor
- * observer
- * timeout
- * tracer
- * uri
- * yaml
-* The <tt>did_you_mean</tt> gem has been promoted up to a default gem from a bundled gem
-
-pathname::
-
- * Kernel#Pathname when called with a Pathname argument now returns
- the argument instead of creating a new Pathname. This is more
- similar to other Kernel methods, but can break code that modifies
- the return value and expects the argument not to be modified.
-
-profile.rb, Profiler__::
-
- * Removed from standard library. It was unmaintained since Ruby 2.0.0.
-
=== C API updates
-* Many <code>*_kw</code> functions have been added for setting whether
- the final argument being passed should be treated as keywords. You
- may need to switch to these functions to avoid keyword argument
- separation warnings, and to ensure correct behavior in Ruby 3.
-
-* The <code>:</code> character in rb_scan_args format string is now
- treated as keyword arguments. Passing a positional hash instead of
- keyword arguments will emit a deprecation warning.
-
-* C API declarations with +ANYARGS+ are changed not to use +ANYARGS+.
- See https://github.com/ruby/ruby/pull/2404
-
=== Implementation improvements
-Fiber::
-
- * Allow selecting different coroutine implementations by using
- +--with-coroutine=+, e.g.
-
- $ ./configure --with-coroutine=ucontext
- $ ./configure --with-coroutine=copy
-
- * Replace previous stack cache with fiber pool cache. The fiber pool
- allocates many stacks in a single memory region. Stack allocation
- becomes O(log N) and fiber creation is amortized O(1). Around 10x
- performance improvement was measured in micro-benchmarks.
- https://github.com/ruby/ruby/pull/2224
-
-File::
- * File.realpath now uses realpath(3) on many platforms, which can
- significantly improve performance. [Feature #15797]
-
-Hash::
- * Change data structure of small Hash objects. [Feature #15602]
-
-Monitor::
- * Monitor class is written in C-extension. [Feature #16255]
-
-Thread::
-
- * VM stack memory allocation is now combined with native thread stack,
- improving thread allocation performance and reducing allocation related
- failures. Around 10x performance improvement was measured in micro-benchmarks.
-
-JIT::
-
- * JIT-ed code is recompiled to less-optimized code when an optimization assumption is invalidated.
-
- * Method inlining is performed when a method is considered as pure.
- This optimization is still experimental and many methods are NOT considered as pure yet.
-
- * The default value of +--jit-max-cache+ is changed from 1,000 to 100.
-
- * The default value of +--jit-min-calls+ is changed from 5 to 10,000.
-
-RubyVM::
-
- * Per-call-site method cache, which has been there since around 1.9, was
- improved: cache hit rate raised from 89% to 94%.
- See https://github.com/ruby/ruby/pull/2583
-
-RubyVM::InstructionSequence::
-
- * RubyVM::InstructionSequence#to_binary method generates compiled binary.
- The binary size is reduced. [Feature #16163]
-
=== Miscellaneous changes
-
-* Support for IA64 architecture has been removed. Hardware for testing was
- difficult to find, native fiber code is difficult to implement, and it added
- non-trivial complexity to the interpreter. [Feature #15894]
-
-* Require compilers to support C99. [Misc #15347]
-
- * Details of our dialect: https://bugs.ruby-lang.org/projects/ruby-trunk/wiki/C99
-
-* Ruby's upstream repository is changed from Subversion to Git.
-
- * https://git.ruby-lang.org/ruby.git
-
- * RUBY_REVISION class is changed from Integer to String.
-
- * RUBY_DESCRIPTION includes Git revision instead of Subversion's one.
-
-* Support built-in methods in Ruby with the <code>_\_builtin_</code> syntax. [Feature #16254]
-
- Some methods are defined in *.rb (such as trace_point.rb).
- For example, it is easy to define a method which accepts keyword arguments.