What's Changed

• Bug #21145: Prism accepts newlines in-between curly unicode escape - Ruby - Ruby Issue Tracking System
• Bug #21153: ::Foo ||= p 1 should parse - Ruby - Ruby Issue Tracking System
• Bug #21030: Bug: #step with Range<ActiveSupport::Duration> behavior broken on Ruby 3.4.1 - Ruby - Ruby Issue Tracking System
• Bug #21131: IO.copy_stream: yielded string changes value when duped - Ruby - Ruby Issue Tracking System
• Feature #19521: Support for Module#name= and Class#name=. - Ruby - Ruby Issue Tracking System
• Bug #21159: Module#set_temporary_name should freeze given name - Ruby - Ruby Issue Tracking System
• Bug #21161: Crash when locale is set to Turkish tr_TR.UTF-8 - Ruby - Ruby Issue Tracking System
• Bug #21144: Win32: Use Windows time zone ID as the time zone name if TZ is not set - Ruby - Ruby Issue Tracking System
• Bug #21170: Corrupted Hash (bad VALUE and missing entry) when -1 returned from .hash - Ruby - Ruby Issue Tracking System
• Bug #21172: Race condition in register_fstring - Ruby - Ruby Issue Tracking System
• Bug #21163: Inconsistencies in Kernel.Float compared to other number parsing methods - Ruby - Ruby Issue Tracking System
• Bug #21173: RUBY_FREE_AT_EXIT does not work when error in -r - Ruby - Ruby Issue Tracking System
• Bug #21179: Introduction Happy Eyeballs Version 2 broke Socket.tcp from secondary Ractors - Ruby - Ruby Issue Tracking System
• Bug #19841: Marshal.dump stack overflow with recursive Time - Ruby - Ruby Issue Tracking System
• Bug #21180: SEGV while marking imemo_env->iseq - Ruby - Ruby Issue Tracking System
• Bug #21186: Inconsistent parsing of ?あand 0 - Ruby - Ruby Issue Tracking System
• Bug #21094: Module#set_temporary_name does not affect a name of a nested module - Ruby - Ruby Issue Tracking System
• Bug #21195: Crash when using IO#timeout - Ruby - Ruby Issue Tracking System
• Bug #21196: Ruby 3.4 ignores visibility when passing arguments using ... - Ruby - Ruby Issue Tracking System
• Bug #21141: Time#utc? does not work with a timezone object - Ruby - Ruby Issue Tracking System
• Bug #21211: Incomplete Backtrace for Socket Errors in Ruby 3.4+ - Ruby - Ruby Issue Tracking System
• Bug #21197: Prism does not accept newline after defined? keyword - Ruby - Ruby Issue Tracking System
• Bug #21183: Ractor error with Prism::VERSION - Ruby - Ruby Issue Tracking System
• Bug #21217: Integer.sqrt produces wrong results even on input <= 1e18 - Ruby - Ruby Issue Tracking System
• Bug #21220: Memory corruption in update_line_coverage() [write at index -1] - Ruby - Ruby Issue Tracking System

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_4_2...v3_4_3

What's Changed

• Bump net-imap to 0.4.19 for Ruby 3.3 (CVE-2025-25186) by nevans · Pull Request #12732
• Bug #21170: Corrupted Hash (bad VALUE and missing entry) when -1 returned from .hash - Ruby - Ruby Issue Tracking System
• Bug #20951: Confusing handling of timezone object's #utc_to_local results - Ruby - Ruby Issue Tracking System
• Bug #21046: Backport: TLS fix for ARM64 - Ruby - Ruby Issue Tracking System
• Bug #21032: Module#autoload? is slow when $LOAD_PATH contains a relative path - Ruby - Ruby Issue Tracking System
• Bug #21095: Prefer uname -n over hostname in tests. - Ruby - Ruby Issue Tracking System
• Bug #21112: Typo in error message when an incorrect key is used with WeakKeyMap - Ruby - Ruby Issue Tracking System
• Bug #21092: error building ruby 3.4.1 on cygwin/msys2 - Ruby - Ruby Issue Tracking System
• Bug #21159: Module#set_temporary_name should freeze given name - Ruby - Ruby Issue Tracking System
• Bug #21172: Race condition in register_fstring - Ruby - Ruby Issue Tracking System
• Bug #21144: Win32: Use Windows time zone ID as the time zone name if TZ is not set - Ruby - Ruby Issue Tracking System
• Bug #21180: SEGV while marking imemo_env->iseq - Ruby - Ruby Issue Tracking System
• Bug #21131: IO.copy_stream: yielded string changes value when duped - Ruby - Ruby Issue Tracking System
• Bug #19841: Marshal.dump stack overflow with recursive Time - Ruby - Ruby Issue Tracking System
• Bug #21186: Inconsistent parsing of ?あand 0 - Ruby - Ruby Issue Tracking System
• Bug #21094: Module#set_temporary_name does not affect a name of a nested module - Ruby - Ruby Issue Tracking System
• Bug #21195: Crash when using IO#timeout - Ruby - Ruby Issue Tracking System
• Bug #20984: ENV.inspect is not encoding aware - Ruby - Ruby Issue Tracking System
• Bug #21027: not() receiver should be nil - Ruby - Ruby Issue Tracking System
• Bug #21217: Integer.sqrt produces wrong results even on input <= 1e18 - Ruby - Ruby Issue Tracking System
• Bug #21141: Time#utc? does not work with a timezone object - Ruby - Ruby Issue Tracking System

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_3_7...v3_3_8

Security fixes

• CVE-2025-27219, CVE-2025-27220 and CVE-2025-27221

What's Changed

• Bug #21092: error building ruby 3.4.1 on cygwin/msys2 - Ruby - Ruby Issue Tracking System
• Bug #21170: Corrupted Hash (bad VALUE and missing entry) when -1 returned from .hash - Ruby - Ruby Issue Tracking System
• Bug #21144: Win32: Use Windows time zone ID as the time zone name if TZ is not set - Ruby - Ruby Issue Tracking System
• Bug #18257: rb_mRubyVMFrozenCore is broken by GC run - Ruby - Ruby Issue Tracking System
• Bug #21032: Module#autoload? is slow when $LOAD_PATH contains a relative path - Ruby - Ruby Issue Tracking System
• Bug #21131: IO.copy_stream: yielded string changes value when duped - Ruby - Ruby Issue Tracking System
• Bug #19584: Crash in rb_gc_register_address - Ruby - Ruby Issue Tracking System
• Bug #21180: SEGV while marking imemo_env->iseq - Ruby - Ruby Issue Tracking System
• Bug #20025: Parsing identifiers/constants is case-folding dependent - Ruby - Ruby Issue Tracking System
• Bug #19426: Endless Range#step of object with #succ method does not work - Ruby - Ruby Issue Tracking System

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_2_7...v3_2_8

Security fixes

• CVE-2025-27219, CVE-2025-27220 and CVE-2025-27221
• Update REXML-3.3.4 and rss-0.3.1 as bundled gems

What's Changed

• Bug #20516: The version of rexml in ruby 3.3.2 has not been updated since 3.2.6. - Ruby - Ruby Issue Tracking System
• Improve base time of assert_linear_performance by tompng · Pull Request #11369

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_1_6...v3_1_7

What's Changed

• Bug #21024: Ruby including generates compilation warning with GCC 15, header is deprecated in C++17,
• Bug #21021: "try to mark T_NONE object" with 3.4.1
• Bug #20997: YJIT panic assertion left == right failed: leave instruction expects stack size 1, but was: 2
• Bug #20981: rb_undefine_finalizer is missing
• Bug #20989: Segmentation fault in Ripper when lexing /#{"\xcd"}/
• Bug #21003: unexpected warning about ignored block
• Bug #21002: Please include license information of turbo_tests
• Bug #21001: unexpected nil result from proc with ensure and next
• Bug #21010: Endless method definition of []= is SyntaxError in parse.y but allowed in Prism
• Bug #20992: eval(ascii_encoded_code) raises EncodingError when multibyte local variable exists
• Bug #21017: --with-parser=parse.y configure option does not work
• Bug #21014: Prism doesn't set node_id on iseqs correctly
• Bug #21027: not() receiver should be nil
• Bug #20995: exception escapes block given to IO.popen("-") in child process
• Bug #21008: Array#sum, Enumerator#sum, Numeric subclass
• Bug #21044: Prism maximum recursion depth is 1_000, parse.y is 10_000
• Bug #21031: Incompatibility with prism and parse.y when eval'ing unnamed forwarding variables
• Bug #21085: [BUG] Stack consistency error with -ne
• Bug #21048: [Prism] rescue in modifier form with condition behaves differently
• Bug #21046: Backport: TLS fix for ARM64
• Bug #21012: Compiling a['a','b'],=1 with parse.y fails
• Bug #21038: Preserve errno in rb_fiber_scheduler_unblock
• Bug #21032: Module#autoload? is slow when $LOAD_PATH contains a relative path
• Bug #21092: error building ruby 3.4.1 on cygwin/msys2
• Bug #21095: Prefer uname -n over hostname in tests.
• Bug #21103: Binding problem with delegate methods
• Bug #21088: TCPSocket.new raises Socket::ResolutionError instead of Errno::ECONNREFUSED for hosts defined in /etc/hosts
• Bug #21112: Typo in error message when an incorrect key is used with WeakKeyMap
• Bug #21117: Inconsistent behaviour between "_1" and "it" variables
• Bug #21114: Prism hangs up while parsing deeply nested def
• Bug #20984: ENV.inspect is not encoding aware
• Bug #20982: Inconsistency between Hash#inspect and ENV.inspect in Ruby 3.4

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_4_1...v3_4_2

What's Changed

• Bug #20853: Hash key retrieval after Process.warmup
• Bug #20868: Method#hash changes after compaction
• Bug #20883: sprintf with binary strings has incorrect coderange
• Bug #20873: printf("%f") returns wrong result for Rational with FIXNUM_MIN
• Bug #20898: Backport https://github.com/ruby/ruby/pull/9737 to Ruby 3.3 and 3.2
• Bug #20871: Including methods in Enumerable doesn't make them available in Array
• Bug #20907: Fiber scheduler does not correctly re-lock mutex if Mutex#sleep is interrupted.
• Bug #20909: Backport String indexing bug fixes
• Bug #20921: Use-after-free in constant cache
• Bug #20915: Segfault with TracePoint#parameters and aliased C method
• Bug #20447: Ruby 3.3.1 broken on i686 due to "incompatible pointer type" error
• Bug #20924: IO#readline ignores the limit argument when the encoding is UTF-32LE and the limit would split a character
• Bug #20984: ENV.inspect is not encoding aware
• Bug #20995: exception escapes block given to IO.popen("-") in child process
• Bug #21008: Array#sum, Enumerator#sum, Numeric subclass
• Bug #21012: Compiling a['a','b'],=1 with parse.y fails
• Bug #21038: Preserve errno in rb_fiber_scheduler_unblock
• Bug #20997: YJIT panic assertion left == right failed: leave instruction expects stack size 1, but was: 2

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_2_6...v3_2_7

What's Changed

• Bug #20883: sprintf with binary strings has incorrect coderange
• Bug #20886: Crash due to double free on regex timeout after stack allocations
• Bug #20892: ObjectSpace.dump can produce broken JSON for classes with temporary names
• [Backport 3.3] wasm: align fiber stack pointer to 16 bytes by kateinoigakukun · Pull Request #12101
• Bug #20787: IO#readline does not check its arguments like IO#gets and will read more data than limit
• Bug #20868: Method#hash changes after compaction
• Bug #20873: printf("%f") returns wrong result for Rational with FIXNUM_MIN
• Bug #20907: Fiber scheduler does not correctly re-lock mutex if Mutex#sleep is interrupted.
• Bug #20871: Including methods in Enumerable doesn't make them available in Array
• Bug #20909: Backport String indexing bug fixes
• Bug #20915: Segfault with TracePoint#parameters and aliased C method
• Bug #20921: Use-after-free in constant cache
• Bug #20924: IO#readline ignores the limit argument when the encoding is UTF-32LE and the limit would split a character
• Bug #20950: Use-after-free in ep in Proc#dup for ifunc procs
• Bug #21012: Compiling a['a','b'],=1 with parse.y fails
• Bug #20984: ENV.inspect is not encoding aware
• Bug #20995: exception escapes block given to IO.popen("-") in child process
• Bug #21008: Array#sum, Enumerator#sum, Numeric subclass
• Bug #21038: Preserve errno in rb_fiber_scheduler_unblock
• Bug #20997: YJIT panic assertion left == right failed: leave instruction expects stack size 1, but was: 2

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_3_6...v3_3_7

What's Changed

This version only changed version number of Ruby 3.4.0.

Full Changelog

v3_4_0...v3_4_1

This release only listed between 3.4.0-rc1 and 3.4.0 final release. See also 3.4.0-preview1, 3.4.0-preview2 and 3.4.0-rc1.

What's Changed

• Launchable: Start recording test-spec results by ono-max · Pull Request #12302
• Feature #20884: reserve "Ruby" toplevel module for Ruby language
• Feature #20875: Atomic initialization for Ractor local storage
• [DOC] Fix grammar errors, typos, and improve readability of trace_point.rb by st0012 · Pull Request #12150
• Bug #20918: Prism error indicates line number of -e that does not exist
• Feature #20861: Add an environment variable for tuning the default thread quantum
• [DOC] Improve formatting in Markdown files by amomchilov · Pull Request #12322
• Improve "Building Ruby" docs by amomchilov · Pull Request #12320
• get rid of unknown error on travis-ci by nobu · Pull Request #1171
• Launchable: Refactor entrypoint.sh by ono-max · Pull Request #12314
• Bug #20950: Use-after-free in ep in Proc#dup for ifunc procs
• YJIT: Speculate block arg for c_func_method(&nil) calls by XrXr · Pull Request #12326
• [DOC] Fix incorrect Array#fetch_values examples by kyanagi · Pull Request #12337
• [DOC] Improve array.rb documentation by alexcrocha · Pull Request #12340
• Feature #20205: Enable frozen_string_literal by default
• Bug #20952: A weird error message for []= with keyword arguments
• Bug #20638: Threads not collected by GC under RUBY_MN_THREADS=1
• Improve APIs for Globally Enabling/Disabling fast_fallback in Socket by shioimm · Pull Request #12257
• Update NEWS.md for Socket.tcp and TCPSocket.new by shioimm · Pull Request #12347
• Bug #20927: { **{ } } behaves differently when shareable_constant_value: experimental_everything
• Bug #20951: Confusing handling of timezone object's #utc_to_local results
• Bug #20940: Colored syntax error from prism
• [DOC] Adjust argument unpacking docs and document **nil by zverok · Pull Request #12228
• Bug #20954: Ractor.main? returns 0 on the main ractor
• Bug #20785: Should a in b, and c a in b, or c a in b, rescue c be syntax ok?
• Add back summary table for pack/unpack directives by eregon · Pull Request #12349
• Fix constant documents by soutaro · Pull Request #12357
• Launchable: Start recording test-spec in compilers.yaml by ono-max · Pull Request #12364
• Bug #20956: Nested alternation pattern matching bug in 3.4.0-rc1
• [DOC] Change arg names from n to count by BurdetteLamar · Pull Request #12288
• YJIT: Load registers on JIT entry to reuse blocks by k0kubun · Pull Request #12355
• [DOC] Added references of github releases for bundled gems by hsbt · Pull Request #12365
• Wrap do_fast_fallback_getaddrinfo with rb_thread_prevent_fork by shioimm · Pull Request #12366
• Bug #20963: compile error due to lack of MAYBE_UNUSED macro e.g. Oracle Developer Studio 12.x on Solaris 10
• Bug #20433: Hash.inspect for some hash returns syntax invalid representation
• Document 'it' and update numbered parameters docs by zverok · Pull Request #12375
• Bug #20965: it vs binding.local_variables
• Bug #20969: Segmentation fault with Ripper.lex '/(?<_1>)/=~s'
• Bundle rbs-3.8 by soutaro · Pull Request #12399
• Bug #20942: Infinite loop when out of memory
• Fix tests for fast_fallback by shioimm · Pull Request #12406
• Bug #20973: it in pattern matching pin operator causes BUG
• [DOC] Refresh standard libraries page by st0012 · Pull Request #12404
• Bug #20916: Prism compiler should support ** in Ractor constant
• Properly document Ractor#require by zverok · Pull Request #12389
• [DOC] Move Time#xmlschema docs to the core by zverok · Pull Request #12403
• Bug #3456: bisarre comma
• Improve doc for Socket::ResolutionError by shioimm · Pull Request #12434
• Bug #20978: Ractor[]/Thread[]/Fiber[] behavior difference
• YJIT: Return None if entry block compilation fails by k0kubun · Pull Request #12445
• Bug #20779: Un-rescuable thread creation limit on Mac
• Bug #19562: Setting default_(in|ex)ternal encoding after running an Ractor freezes ruby
• Bug #20929: TestTime have an assertion different from current implementation.
• Bug #20979: +comment does not affect parsetree without --parser=parse.y
• Bundle rbs-3.8.0 by soutaro · Pull Request #12453
• Introduce a timeout to prevent rb_thread_fd_select from hanging with write(2) failure by shioimm · Pull Request #12457
• [DOC] Adjust documentation related to backtraces by zverok · Pull Request #12420

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

v3_4_0_rc1...v3_4_0

What's Changed

• YJIT: Add --yjit-mem-size option by k0kubun · Pull Request #11810
• [DOC] Tweaks for Array#permutation by BurdetteLamar · Pull Request #11802
• [DOC] Tweaks for Array#pop by BurdetteLamar · Pull Request #11821
• YJIT: Fastpath for Module#name by XrXr · Pull Request #11819
• [DOC] Tweaks for Array#product by BurdetteLamar · Pull Request #11823
• Bug #20791: RbCONFIG::CONFIG does not have a LIBRUBY_RELATIVE key on mswin
• Bug #20789: ->a=1...{} is syntax error in 3.4.0dev parse.y
• intern.h: mark rb_num_zerodiv as NORETURN by xiw · Pull Request #147
• Bug #20631: Build failure with Xcode 16 beta and macOS 15 (Sequoia) Beta
• Bug #20788: Prism issues unused variable warnings for negative line numbers
• [DOC] Tweaks for Array#repeated_combination by BurdetteLamar · Pull Request #11839
• [DOC] Tweaks for Array#reverse_each by BurdetteLamar · Pull Request #11855
• Update rsock_connect to take VALUE io argument. by ioquatix · Pull Request #11847
• Remove 1 allocation in Enumerable#each_with_index by XrXr · Pull Request #11868
• YJIT: Improve build instructions for non-hackers by XrXr · Pull Request #11878
• [DOC] Tweaks for Array#repeated_permutation by BurdetteLamar · Pull Request #11873
• [DOC] Tweaks for Array#sample by BurdetteLamar · Pull Request #11876
• [DOC] Tweaks for Array#rotate! by BurdetteLamar · Pull Request #11875
• Support IO#timeout for rsock_connect. by ioquatix · Pull Request #11880
• [DOC] Tweaks for Array#shift by BurdetteLamar · Pull Request #11886
• Bug #20797: UTC offset seconds part is not checked
• [DOC] Tweaks for Array#shuffle! by BurdetteLamar · Pull Request #11891
• Bug #20799: Bug in forwarding to struct methods
• Making StringIO#to_s behave as one would expect by awebneck · Pull Request #149
• [DOC] Tweaks for Array#slice! by BurdetteLamar · Pull Request #11902
• [DOC] Tweaks for Array#sort by BurdetteLamar · Pull Request #11907
• YJIT: Add compilation log by nirvdrum · Pull Request #11818
• YJIT: Allow shareable consts in multi-ractor mode by jhawthorn · Pull Request #11917
• Feature #20205: Enable frozen_string_literal by default
• Bug #20796: Segmentation fault in rubyzip tests with ruby 3.4.0-preview2~659 e7cb70be4e on x86_64-darwin24
• YJIT: Rename method substitution functions and improve docs (+1) by XrXr · Pull Request #11919
• Bug #20804: Stop reserving stack ahead-of-time in on Linux
• [DOC] Tweaks for Array#take by BurdetteLamar · Pull Request #11929
• [DOC] Tweaks for Array#take_while by BurdetteLamar · Pull Request #11930
• Rewrite Numeric#dup and Numeric#+@ in Ruby by k0kubun · Pull Request #11933
• Rb ary inspect by BurdetteLamar · Pull Request #11935
• Bug #20803: Windows intermittent spec failure - ObjectSpace.memsize_of(:abc)
• grammar, 'same as a' for Proc#arity by BenMorganIO · Pull Request #764
• [DOC] Tweaks for Array#uniq! by BurdetteLamar · Pull Request #11950
• [DOC] Tweaks for Array#uniq by BurdetteLamar · Pull Request #11949
• Introduce Fiber Scheduler blocking_region hook. by ioquatix · Pull Request #11963
• Feature #19528: JSON.load defaults are surprising (create_additions: true)
• Bug #20853: Hash key retrieval after Process.warmup
• Add documentation for RUBY_ASSERT_CRITICAL_SECTION. by ioquatix · Pull Request #11982
• YJIT: Replace Array#each only when YJIT is enabled by k0kubun · Pull Request #11955
• Bug #20762: make test-basic with -DRGENGC_FORCE_MAJOR_GC is always failure
• Bug #20856: Incorrect and inconsistent multi-thread eval execution with Prism compiler
• Feature #15554: warn/error passing a block to a method which never use a block
• Bug #20873: printf("%f") returns wrong result for Rational with FIXNUM_MIN
• Bug #20868: Method#hash changes after compaction
• Bug #20745: IO::Buffer#copy triggers UB when src/dest buffers overlap
• ubf_th appears to be unused. by ioquatix · Pull Request #11994
• [DOC] Doc for Array#values_at by BurdetteLamar · Pull Request #11960
• Bug #20802: It is possible to set the encoding of an IO instance to one that requires binmode when binmode is not set
• Bug #20869: IO buffer handling is inconsistent when seeking
• Feature #19790: Optionally write Ruby crash reports into a file rather than STDERR
• Feature #20715: Ractor.[] and Ractor.[]= to access Ractor local storage
• Feature #20627: require on Ractor should run on the main Ractor
• Feature #20811: warning: in a**b, b may be too big is really helpful?
• [DOC] Doc for Array#zip by BurdetteLamar · Pull Request #11961
• Bug #20883: sprintf with binary strings has incorrect coderange
• Bug #20800: Don't place ruby executable into /usr/libexec/x86_64-linux/bin
• Fix false-positive memory leak using Valgrind in YJIT by peterzhu2118 · Pull Request #12057
• Bug #20808: Data#pretty_print doesn't handle private or remove attribute readers
• Bug #20886: Crash due to double free on regex timeout after stack allocations
• Allow Net::HTTP#request to raise Net::OpenTimeout by shioimm · Pull Request #12062
• Bug #20892: ObjectSpace.dump can produce broken JSON for classes with temporary names
• Feature #20350: Return chilled string from Symbol#to_s
• YJIT: Specialize String#[] (String#slice) with fixnum arguments by rwstauner · Pull Request #12069
• YJIT: Add inline_block_count stat by k0kubun · Pull Request #12081
• Feature #20794: Expose information about the currently running GC module
• Do not wait connection attempt delay without in progress fds by shioimm · Pull Request #12087
• YJIT: Specialize Integer#pred by k0kubun · Pull Request #12082
• YJIT: Specialize String#dup by k0kubun · Pull Request #12090
• Make fast_fallback option false by default temporarily by shioimm · Pull Request #12070
• Disable HEv2 tests temporarily by shioimm · Pull Request #12097
• Fix stack-use-after-return by shioimm · Pull Request #12105
• Bug #20900: Net.send(:remove_const, :HTTPSession) does not emit warnings
• Feature #20901: What's status of Refinement#refined_class?
• Feature #20876: Introduce Fiber::Scheduler#blocking_operation_wait to avoid stalling the event loop.
• Feature #20902: Allow IO::Buffer#copy to release the GVL.
• Bug #20871: Including methods in Enumerable doesn't make them available in Array
• Bug #20863: zlib.c calls rb_str_set_len and rb_str_modify_expand(and others) without holding the GVL.
• [YJIT: Make compilat...