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4.0

open

about 9 months late (12/25/2025)

91%

23 issues   (21 closed — 2 open)

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Bug

12/14
Feature

9/9
Related issues
Bug #19765: Ractor.make_shareable ignores self of a proc created from a Method Actions
Bug #20905: Ruby VM hangs while using ractors Actions
Bug #20998: rb_str_locktmp() changes flags of frozen strings and string literals Actions
Bug #21398: Ractor.select hangs when multiple threads submit heavy jobs concurrently Actions
Bug #21547: SEGV after 2083fa commit Actions
Bug #21648: [prism] ruby crashes for `for * in [10]; end` Actions
Bug #21707: Destructuring assignment of SimpleDelegator wrapped array bug with YJIT Actions
Bug #21710: Segfault when reading object_id after it is set inside RUBY_INTERNAL_EVENT_NEWOBJ Actions
Bug #21792: 4.0.0-preview3: Build fails with `--with-ext=` when ENABLE_SHARED=yes: ruby/digest.h not found for rubyspec CAPI extensions Actions
Bug #21814: 0.pow(2,-9999999999999999990) should be zero Actions
Bug #22190: Class#subclasses does not include clones of classes that include modules Actions
Bug #22217: Segmentation fault when resuming execution with `Coverage.start` and ruby/debug Actions
Bug #22294: Parsing a long && / || chain is quadratic Actions
Bug #22313: Bytecode compilation is quadratic in the size of a method due to remove_unreachable_chunk Actions
Feature #19057: Hide implementation of `rb_io_t`. Actions
Feature #21221: Proposal to upstream ZJIT Actions
Feature #21262: Proposal: `Ractor::Port` Actions
Feature #21268: Implement a lock-free hash set for fstring table Actions
Feature #21275: Update to Unicode 17.0 Actions
Feature #21311: Namespace on read (revised) Actions
Feature #21550: Ractor.shareable_proc/shareable_lambda to make sharable Proc object Actions
Feature #21557: Ractor.shareable_proc to make sharable Proc objects, safely and flexibly Actions
Feature #21701: Enumerator.produce accepts an optional `size` keyword argument Actions

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