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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
## 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]]
* 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
* irb 1.6.3
* optparse 0.4.0.pre.1
* psych 5.1.0
* reline 0.3.3
* stringio 3.0.6
* strscan 3.0.7
* timeout 0.3.2
The following bundled gems are updated.
* minitest 5.18.0
* rbs 3.0.4
* typeprof 0.21.7
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
## C API updates
## Implementation improvements
## JIT
[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
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