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# NEWS for Ruby 3.3.0
This document is a list of user-visible feature changes
since the **3.2.0** release, except for bug fixes.
Note that each entry is kept to a minimum, see links for details.
## Language changes
## Command line options
* A new `performance` warning category was introduced.
They are not displayed by default even in verbose mode.
Turn them on with `-W:performance` or `Warning[:performance] = true`. [[Feature #19538]]
* The `RUBY_GC_HEAP_INIT_SLOTS` environment variable has been deprecated and
removed. Environment variables `RUBY_GC_HEAP_%d_INIT_SLOTS` should be
used instead. [[Feature #19785]]
## Core classes updates
Note: We're only listing outstanding class updates.
* Array
* Array#pack now raises ArgumentError for unknown directives. [[Bug #19150]]
* Dir
* Dir.for_fd added for returning a Dir object for the directory specified
by the provided directory file descriptor. [[Feature #19347]]
* Dir.fchdir added for changing the directory to the directory specified
by the provided directory file descriptor. [[Feature #19347]]
* Dir#chdir added for changing the directory to the directory specified by
the provided `Dir` object. [[Feature #19347]]
* MatchData
* MatchData#named_captures now accepts optional `symbolize_names`
keyword. [[Feature #19591]]
* String
* String#unpack now raises ArgumentError for unknown directives. [[Bug #19150]]
* String#bytesplice now accepts new arguments index/length or range of the
source string to be copied. [[Feature #19314]]
* ObjectSpace::WeakKeyMap
* New core class to build collections with weak references.
The class use equality semantic to lookup keys like a regular hash,
but it doesn't hold strong references on the keys. [[Feature #18498]]
* Module
* Module#set_temporary_name added for setting a temporary name for a
module. [[Feature #19521]]
* Process.warmup
* Notify the Ruby virtual machine that the boot sequence is finished,
and that now is a good time to optimize the application. This is useful
for long running applications. The actual optimizations performed are entirely
implementation specific and may change in the future without notice. [[Feature #18885]]
* Refinement
* Add Refinement#target as an alternative of Refinement#refined_class.
Refinement#refined_class is deprecated and will be removed in Ruby
3.4. [[Feature #19714]]
## Stdlib updates
* RubyGems and Bundler warn if users require gem that is scheduled to become the bundled gems
in the future version of Ruby. [[Feature #19351]] [[Feature #19776]] [[Feature #19843]]
* Random::Formatter#alphanumeric is extended to accept optional `chars`
keyword argument. [[Feature #18183]]
The following default gems are updated.
* RubyGems 3.5.0.dev
* bigdecimal 3.1.4
* bundler 2.5.0.dev
* csv 3.2.8
* erb 4.0.3
* fiddle 1.1.2
* fileutils 1.7.1
* irb 1.8.1
* nkf 0.1.3
* optparse 0.4.0.pre.1
* psych 5.1.0
* reline 0.3.8
* stringio 3.0.9
* strscan 3.0.7
* syntax_suggest 1.1.0
* time 0.2.2
* timeout 0.4.0
* uri 0.12.2
* yarp 0.11.0
The following bundled gems are updated.
* minitest 5.20.0
* test-unit 3.6.1
* rexml 3.2.6
* rss 0.3.0
* net-imap 0.3.7
* rbs 3.2.1
* typeprof 0.21.8
* debug 1.8.0
The following default gem is now bundled.
* racc 1.7.1
See GitHub releases like [Logger](https://github.com/ruby/logger/releases) or
changelog for details of the default gems or bundled gems.
## Supported platforms
## Compatibility issues
## Stdlib compatibility issues
* `racc` is promoted bundled gems.
* You need to add `racc` to your `Gemfile` if you use `racc` under bundler environment.
* `ext/readline` is retired
* We have `reline` that is pure Ruby implementation compatible with `ext/readline` API. We rely on `reline` in the future. If you need to use `ext/readline`, you can install `ext/readline` via rubygems.org with `gem install readline-ext`.
* We no longer need to install libraries like `libreadline` or `libedit`.
## C API updates
## Implementation improvements
* `defined?(@ivar)` is optimized with Object Shapes.
### YJIT
* Major performance improvements over 3.2
* Support for splat and rest arguments has been improved.
* Registers are allocated for stack operations of the virtual machine.
* More calls with optional arguments are compiled.
* Exception handlers are also compiled.
* Instance variables no longer exit to the interpreter
with megamorphic Object Shapes.
* Unsupported call types no longer exit to the interpreter.
* Integer#!=, String#!=, Kernel#block_given?, Kernel#is_a?,
Kernel#instance_of?, Module#=== are specially optimized.
* Now more than 3x faster than the interpreter on optcarrot!
* Metadata for compiled code uses a lot less memory.
* Generate more compact code on ARM64
* Option to start YJIT in paused mode and then later enable it manually
* `--yjit-pause` and RubyVM::YJIT.resume
* This can be used to enable YJIT only once your application is done booting
* `ratio_in_yjit` stat produced by `--yjit-stats` is now avaiable in release builds,
a special stats or dev build is no longer required.
* Exit tracing option now supports sampling
* `--trace-exits-sample-rate=N`
* `--yjit-stats=quiet` is added to avoid printing stats on exit.
* The default value for `--yjit-exec-mem-size` is changed from 64 to 128.
* More thorough testing and multiple bug fixes
### RJIT
* Introduced a pure-Ruby JIT compiler RJIT and replaced MJIT.
* RJIT supports only x86\_64 architecture on Unix platforms.
* Unlike MJIT, it doesn't require a C compiler at runtime.
* RJIT exists only for experimental purposes.
* You should keep using YJIT in production.
[Feature #18183]: https://bugs.ruby-lang.org/issues/18183
[Feature #18498]: https://bugs.ruby-lang.org/issues/18498
[Feature #18885]: https://bugs.ruby-lang.org/issues/18885
[Bug #19150]: https://bugs.ruby-lang.org/issues/19150
[Feature #19314]: https://bugs.ruby-lang.org/issues/19314
[Feature #19347]: https://bugs.ruby-lang.org/issues/19347
[Feature #19351]: https://bugs.ruby-lang.org/issues/19351
[Feature #19521]: https://bugs.ruby-lang.org/issues/19521
[Feature #19538]: https://bugs.ruby-lang.org/issues/19538
[Feature #19591]: https://bugs.ruby-lang.org/issues/19591
[Feature #19714]: https://bugs.ruby-lang.org/issues/19714
[Feature #19776]: https://bugs.ruby-lang.org/issues/19776
[Feature #19785]: https://bugs.ruby-lang.org/issues/19785
[Feature #19843]: https://bugs.ruby-lang.org/issues/19843
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