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 compilation_failure a default stat by XrXr · Pull Request #12128
• Update scheduler.c to use RUBY_ASSERT. by ioquatix · Pull Request #12129
• bignum nogvl is offload safe. by ioquatix · Pull Request #12132
• Bug #20866: Prism assertion when running simplecov with branch coverage and requiring certain code
• Bug #20903: Segmentation fault when string encoding
• Feature #20860: Merge Optional Experimental Feature MMTk into Ruby
• Feature #20563: Drop support for old Windows
• Save the error that occurred during name resolution by shioimm · Pull Request #12155
• UBF is also required for synchronous name resolution by shioimm · Pull Request #12156
• Bug #20907: Fiber scheduler does not correctly re-lock mutex if Mutex#sleep is interrupted.
• Do not save the last error without sockets in the connection attempt by shioimm · Pull Request #12153
• YJIT: fix small typo in command line options help by maximecb · Pull Request #12167
• Feature #20293: Add Warning.categories method that returns the warning category names
• Feature #19236: Allow to create hashes with a specific capacity from Ruby
• Optimize instructions when creating an array just to call include? by rwstauner · Pull Request #12123
• YJIT: Implement opt_reverse insn by rwstauner · Pull Request #12175
• Ensure to free fast_fallback_getaddrinfo_shared with single family by shioimm · Pull Request #12199
• Allow disable to fast_fallback of TCPSocket.new by shioimm · Pull Request #12210
• Ensure to close pipes when TCPSocket.new finishes processing by shioimm · Pull Request #12181
• Bug #20921: Use-after-free in constant cache
• Bug #20915: Segfault with TracePoint#parameters and aliased C method
• Feature #20912: Add warning when redefining id as well as object_id
• Bug #20910: leaked-globals not happy about dtrace related symbols
• Improve the conditions for clearing the Connection Attempt Delay upon connection failure by shioimm · Pull Request #12223
• fix spelling mistake (developper -> developer) by hynkle · Pull Request #116
• Avoid test failures on hosts that only support IPv4 by shioimm · Pull Request #12213
• Enable Launchable integration in compilers.yml by ono-max · Pull Request #12136
• Bug #20928: Current 3.4-dev cannot be built with jemalloc activated in macOS
• YJIT: track time since initialization by maximecb · Pull Request #12263
• YJIT: Generate specialized code for Symbol for objtostring by xodene · Pull Request #12247
• Bundle RBS 3.7 by soutaro · Pull Request #12265
• Launchable: Stop recording tests temporarily by ono-max · Pull Request #12268
• Bug #20918: Prism error indicates line number of -e that does not exist
• Use symbol.h in vm.c to get macro for faster ID to sym by rwstauner · Pull Request #12272
• Bug #20926: shareable_constant_value: experimental_everything crashes with parse.y
• Bug #20929: TestTime have an assertion different from current implementation.
• YJIT: small fix to stats formatting. by maximecb · Pull Request #12282
• [DOC] New homepage for docs.ruby-lang.org/en by st0012 · Pull Request #12227
• Revert "Launchable: Stop recording tests temporarily" by ono-max · Pull Request #12289
• Enable more Launchable integration in bootstraptest and test-all by ono-max · Pull Request #12255
• Launchable: Remove FIXME comment by ono-max · Pull Request #12293
• Fix Connection Attempt Delay of Socket.tcp by shioimm · Pull Request #12291
• YJIT: Only enable disassembly colors for tty by tekknolagi · Pull Request #12283
• Bug #20933: Unexpected IO::Buffer::MaskError in IO::Buffer#xor!
• YJIT: Spill/load argument registers to reuse blocks by k0kubun · Pull Request #12287
• Launchable: Remove unnecessary command launchable verify by ono-max · Pull Request #12299
• Bug #20936: Enumerator's #size returned by Range#reverse_each raises an exception for beginningless Range
• Bug #20924: IO#readline ignores the limit argument when the encoding is UTF-32LE and the limit would split a character
• YJIT: add MPLR talk link. Encourage users to use --yjit-mem-size by maximecb · Pull Request #12305
• Bug #20941: [BUG] object allocation during garbage collection phase reproduction
• Use rb_thread_fd_select instead of select(2) by shioimm · Pull Request #12292
• Bug #20938: Percent String literal delimiter impacts string contents with parse.y

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_preview2...v3_4_0_rc1