4.0

open

12 days late (12/25/2025)

95%

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 #21612: Make sure we never context switch while holding the VM lock	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
		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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