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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]]
## 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]]
## Stdlib updates
The following default gems are updated.
* RubyGems 3.5.0.dev
* bigdecimal 3.1.4
* bundler 2.5.0.dev
* csv 3.2.7
* fiddle 1.1.2
* fileutils 1.7.1
* irb 1.6.4
* optparse 0.4.0.pre.1
* psych 5.1.0
* reline 0.3.3
* stringio 3.0.7
* strscan 3.0.7
* syntax_suggest 1.0.4
* time 0.2.2
* timeout 0.3.2
* uri 0.12.1
The following bundled gems are updated.
* minitest 5.18.0
* test-unit 3.5.8
* rbs 3.1.0
* typeprof 0.21.7
* debug 1.8.0
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
### `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
* Significant performance improvements over 3.2
* Splat and rest arguments support has been improved.
* Registers are allocated for stack operations of the virtual machine.
* More calls with optional arguments are compiled.
* `Integer#!=`, `String#!=`, `Kernel#block_given?`, `Kernel#is_a?`,
`Kernel#instance_of?`, `Module#===` are specially optimized.
* Instance variables no longer exit to the interpreter
with megamorphic Object Shapes.
* Metadata for compiled code uses a lot less memory.
* Improved code generation 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
* Exit tracing option now supports sampling
* `--trace-exits-sample-rate=N`
* 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 #18498]: https://bugs.ruby-lang.org/issues/18498
[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 #19538]: https://bugs.ruby-lang.org/issues/19538
[Feature #19591]: https://bugs.ruby-lang.org/issues/19591
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