Merge pull request #6800 from mruby/stable

2026-06-08 16:11:16 +00:00 · 2026-04-20 18:54:55 +09:00
parent 0112fe6659 831da26b90
commit 7546d53a3a
5 changed files with 372 additions and 3 deletions
@@ -48,7 +48,7 @@ PROJECT_NAME           = mruby
 # could be handy for archiving the generated documentation or if some version
 # control system is used.

-PROJECT_NUMBER         = 3.4.0
+PROJECT_NUMBER         = 4.0.0

 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
@@ -51,6 +51,8 @@ To get mruby, you can download the stable version 4.0.0 from the official mruby
 GitHub repository or clone the trunk of the mruby source tree with the "git
 clone" command. You can also install and compile mruby using [ruby-install](https://github.com/postmodern/ruby-install), [ruby-build](https://github.com/rbenv/ruby-build), [rvm](https://github.com/rvm/rvm), [conda](https://anaconda.org/channels/conda-forge/packages/mruby/overview) or [Homebrew](https://formulae.brew.sh/formula/mruby).

+The release candidate version 4.0.0 of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/archive/4.0.0-rc3.zip](https://github.com/mruby/mruby/archive/4.0.0-rc3.zip)
+
 The latest development version of mruby can be downloaded via the following URL: [https://github.com/mruby/mruby/zipball/master](https://github.com/mruby/mruby/zipball/master)

 The trunk of the mruby source tree can be checked out with the
@@ -40,7 +40,7 @@ To confirm mrdb was installed properly, run mrdb with the `--version` option:

 ```bash
 $ mrdb --version
-mruby 3.4.0 (2025-04-20)
+mruby 4.0.0 (2026-04-20)
 ```

 ## 2.2 Basic Operation
@@ -0,0 +1,367 @@
+# User visible changes in `mruby4.0` from `mruby3.4`
+
+"**_NOTE_**:" are changes to be aware of.
+
+# The language
+
+## Pattern Matching
+
+mruby now supports pattern matching (case/in) syntax:
+
+- Basic pattern matching with `case`/`in` syntax ([dadfac6](https://github.com/mruby/mruby/commit/dadfac6))
+- Array pattern matching ([ec67fd9](https://github.com/mruby/mruby/commit/ec67fd9))
+- Hash pattern matching ([2147263](https://github.com/mruby/mruby/commit/2147263))
+- Find pattern matching (`[*pre, target, *post]`) ([6c4d98b](https://github.com/mruby/mruby/commit/6c4d98b))
+- Pin operator (`^variable`) ([1de6340](https://github.com/mruby/mruby/commit/1de6340))
+- Guard clauses (`if`/`unless` conditions) ([07ac110](https://github.com/mruby/mruby/commit/07ac110))
+- One-line pattern matching (`expr in pattern`) ([e76ce24](https://github.com/mruby/mruby/commit/e76ce24))
+- Brace-less hash pattern support ([e8096bf](https://github.com/mruby/mruby/commit/e8096bf))
+
+## Other Language Changes
+
+- `&nil` in formal parameters to explicitly opt out of block arguments ([b07518e](https://github.com/mruby/mruby/commit/b07518e))
+- Trailing comma in method definition parameters: `def foo(a, b,)` ([f78334b](https://github.com/mruby/mruby/commit/f78334b))
+- Array/Hash/String subclasses can now override `[]` and `[]=` methods ([#6675](https://github.com/mruby/mruby/pull/6675))
+- `OP_SETIDX` optimization for Array and Hash ([ddd8fe1](https://github.com/mruby/mruby/commit/ddd8fe1))
+- `case`/`in` without `else` now raises `NoMatchingPatternError` ([d8de35b](https://github.com/mruby/mruby/commit/d8de35b))
+- Allow compound statement in parenthesized argument context ([919cbd8](https://github.com/mruby/mruby/commit/919cbd8))
+
+# Changes in C API
+
+- **_NOTE_**: `mrb_alloca()` renamed to `mrb_temp_alloc()` ([7fe5c2e](https://github.com/mruby/mruby/commit/7fe5c2e))
+- **_NOTE_**: `mruby/ext/io.h` renamed to `mruby/io.h` ([2813f79](https://github.com/mruby/mruby/commit/2813f79))
+- `mrb_gc_add_region()` for contiguous heap region support ([072855a](https://github.com/mruby/mruby/commit/072855a))
+- `mrb_class_outer()` to get the outer class/module ([3a1b771](https://github.com/mruby/mruby/commit/3a1b771))
+- `MRB_ENSURE()` macro for exception-safe cleanup ([3ac682b](https://github.com/mruby/mruby/commit/3ac682b))
+- `mrb_time_get_tm()` for accessing struct tm ([daaaafe](https://github.com/mruby/mruby/commit/daaaafe))
+- `MRB_OPEN_FAILURE()` macro for checking mrb_open result ([40b0cb9](https://github.com/mruby/mruby/commit/40b0cb9))
+- `mrb_print_error()` now handles NULL gracefully ([8e50a45](https://github.com/mruby/mruby/commit/8e50a45))
+- `mrb_open()` returns mrb_state with exc set on init failure ([05ffe0c](https://github.com/mruby/mruby/commit/05ffe0c))
+- `mrb_utf8_to_buf()` for UTF-8 encoding consolidation ([7e28e68](https://github.com/mruby/mruby/commit/7e28e68))
+- `kh_is_end()` macro for safe khash iteration ([893cc75](https://github.com/mruby/mruby/commit/893cc75))
+- `mrb_bigint_p()` always defined regardless of bigint gem presence ([6c4a8c0](https://github.com/mruby/mruby/commit/6c4a8c0))
+- `RInteger` and `RFloat` added to `RVALUE` union ([13dbca0](https://github.com/mruby/mruby/commit/13dbca0))
+
+# ROM Method Tables
+
+All built-in classes and most extension gems now use read-only method
+tables stored in `.rodata` instead of heap-allocated hash tables. Method
+definitions no longer consume heap memory, significantly reducing memory
+footprint for embedded use.
+
+Core classes converted: BasicObject, Object, Module, Class, Kernel,
+String, Array, Hash, Numeric, Integer, Float, NilClass, TrueClass,
+FalseClass, Range, Symbol, Exception, Proc.
+
+Extension gems converted: mruby-string-ext, mruby-array-ext, mruby-set,
+mruby-struct, mruby-class-ext, mruby-numeric-ext, mruby-random,
+mruby-kernel-ext, mruby-complex, mruby-rational, mruby-io, mruby-socket,
+mruby-method, mruby-metaprog, mruby-time, mruby-hash-ext, mruby-proc-ext,
+mruby-symbol-ext, mruby-range-ext, mruby-object-ext.
+
+# GC and Memory
+
+- **_NOTE_**: `MRB_NO_PRESYM` removed; presym is now always enabled ([81689045](https://github.com/mruby/mruby/commit/81689045))
+- Replace `gcnext` gray linked list with fixed-size gray stack, reducing per-object overhead ([31fea170](https://github.com/mruby/mruby/commit/31fea170))
+- `mrb_gc_add_region()` for providing contiguous memory buffers as GC heap pages ([072855a](https://github.com/mruby/mruby/commit/072855a))
+- Chunk-based pool for symbol string allocation ([e05bd8f](https://github.com/mruby/mruby/commit/e05bd8f))
+- Reduce `IV_INITIAL_SIZE` from 4 to 2 ([6bd1f51](https://github.com/mruby/mruby/commit/6bd1f51))
+- Lossless float encoding using rotation in word boxing ([b6148c8](https://github.com/mruby/mruby/commit/b6148c8))
+- Lossless rotation encoding for 32-bit float32 word boxing ([14a5cfb](https://github.com/mruby/mruby/commit/14a5cfb))
+- Consolidated irep allocation for .mrb loading ([74fb045](https://github.com/mruby/mruby/commit/74fb045))
+- Object shapes (hidden classes) for `MRB_TT_OBJECT` IV storage, sharing key layouts across objects with the same instance variable assignment order ([8d10056](https://github.com/mruby/mruby/commit/8d10056))
+
+# Build & Configuration
+
+- **_NOTE_**: `MRB_WORDBOX_NO_FLOAT_TRUNCATE` renamed to `MRB_WORDBOX_NO_INLINE_FLOAT` (old name still works) ([59e1fe2](https://github.com/mruby/mruby/commit/59e1fe2))
+- **_NOTE_**: `MRB_INT64` on 32-bit now requires `MRB_NO_BOXING` (other boxing modes cannot guarantee alignment for heap-allocated 64-bit integers) ([eaaa66b](https://github.com/mruby/mruby/commit/eaaa66b))
+- Amalgamation support via `rake amalgam` task ([d995ca2](https://github.com/mruby/mruby/commit/d995ca2))
+- New Platform: Cosmopolitan Libc ([#6681](https://github.com/mruby/mruby/pull/6681))
+- Emscripten: use native WASM exception handling ([ca364e3](https://github.com/mruby/mruby/commit/ca364e3))
+- HAL (Hardware Abstraction Layer) for platform abstraction in mruby-io, mruby-socket, mruby-dir, mruby-task ([74ca22f](https://github.com/mruby/mruby/commit/74ca22f))
+- `MRUBY_MIRB_READLINE` environment variable to control readline library selection ([0aafb83](https://github.com/mruby/mruby/commit/0aafb83))
+- MSYS2 drive letter support in build script ([77f6ffe](https://github.com/mruby/mruby/commit/77f6ffe))
+- Inter-gem headers separated from external API headers ([#6671](https://github.com/mruby/mruby/pull/6671))
+
+# Changes in mrbgems
+
+## New Gems
+
+- **mruby-task**: Cooperative multitasking with preemptive scheduling ([ae0d7a0](https://github.com/mruby/mruby/commit/ae0d7a0))
+- **mruby-benchmark**: Benchmarking gem ([2f40f3d](https://github.com/mruby/mruby/commit/2f40f3d))
+- **mruby-strftime**: Time#strftime implementation ([b31e22f](https://github.com/mruby/mruby/commit/b31e22f))
+
+## mruby-bin-mirb Improvements
+
+- Custom multi-line editor replacing readline ([527018c](https://github.com/mruby/mruby/commit/527018c))
+- Syntax highlighting for keywords, strings, result values, hash key symbols ([624272b](https://github.com/mruby/mruby/commit/624272b), [1713d4a](https://github.com/mruby/mruby/commit/1713d4a))
+- Automatic light/dark theme detection via OSC 11 ([db4c8d9](https://github.com/mruby/mruby/commit/db4c8d9))
+- Tab completion support ([2f15282](https://github.com/mruby/mruby/commit/2f15282))
+- Colored output for prompts and errors ([b36e0b4](https://github.com/mruby/mruby/commit/b36e0b4))
+- Auto-indentation and auto-dedent ([d52f318](https://github.com/mruby/mruby/commit/d52f318), [e901b6d](https://github.com/mruby/mruby/commit/e901b6d))
+- Command history with Up/Down navigation ([5f85c1b](https://github.com/mruby/mruby/commit/5f85c1b))
+- Line numbers in multi-line prompts ([5a3f0e2](https://github.com/mruby/mruby/commit/5a3f0e2))
+- UTF-8 multibyte character support ([4a97da3](https://github.com/mruby/mruby/commit/4a97da3))
+
+## mruby-bigint Improvements
+
+- Toom-3 multiplication for large numbers ([99620804](https://github.com/mruby/mruby/commit/99620804))
+- Karatsuba multiplication for medium-sized numbers ([85e81072](https://github.com/mruby/mruby/commit/85e81072))
+- Balance multiplication for asymmetric operands ([0220ec2b](https://github.com/mruby/mruby/commit/0220ec2b))
+- Divide-and-conquer optimization for `to_s` ([990ff90f](https://github.com/mruby/mruby/commit/990ff90f))
+- Consolidated mpn layer for low-level limb operations ([9ef3362f](https://github.com/mruby/mruby/commit/9ef3362f))
+- Always use 32-bit limbs by default ([c747c77f](https://github.com/mruby/mruby/commit/c747c77f))
+
+## Other Gem Changes
+
+- **_NOTE_**: `Hash#deconstruct_keys` removed for CRuby compatibility ([34b9412](https://github.com/mruby/mruby/commit/34b9412))
+- **mruby-enum-lazy**: Fix `Lazy#flat_map` to handle non-enumerable block return values ([#6765](https://github.com/mruby/mruby/pull/6765))
+- **mruby-array-ext**: Add `Array#find` and `Array#rfind` methods
+- **mruby-io**: Add `IO#putc` and `Kernel#putc` ([baff6e6](https://github.com/mruby/mruby/commit/baff6e6))
+- **mruby-random**: Replace xoshiro with PCG for better memory efficiency ([f1bab01](https://github.com/mruby/mruby/commit/f1bab01))
+- **mruby-compiler**: Variable-sized AST nodes for reduced memory usage
+- **mruby-compiler**: `no_return_value` context flag for script optimization ([613b03a](https://github.com/mruby/mruby/commit/613b03a))
+- `initialize_copy` and `respond_to_missing?` defined as private ([#6708](https://github.com/mruby/mruby/pull/6708))
+- Struct keyword argument initialization ([#6574](https://github.com/mruby/mruby/pull/6574))
+
+# Compiler Improvements
+
+- Variable-sized AST nodes for reduced memory consumption ([821b989](https://github.com/mruby/mruby/commit/821b989))
+- Pattern matching bytecode optimizations ([21d4135](https://github.com/mruby/mruby/commit/21d4135))
+- Optimized masgn to generate literals directly into target registers ([fb5d966](https://github.com/mruby/mruby/commit/fb5d966))
+- Optimized splat of literal arrays in args/literals ([1cb8d73](https://github.com/mruby/mruby/commit/1cb8d73))
+- Early termination after too many parse errors ([510ebd7](https://github.com/mruby/mruby/commit/510ebd7))
+- Chunk array literals at 64 elements to reduce register pressure ([f98d641](https://github.com/mruby/mruby/commit/f98d641))
+- Chunk `%w()` and `%i()` literals to reduce register pressure ([62cf0dc](https://github.com/mruby/mruby/commit/62cf0dc))
+
+# VM Optimizations
+
+New super-instructions that fuse common opcode sequences to reduce bytecode size and improve performance:
+
+- `OP_SEND0`/`OP_SSEND0`: Zero-argument method call, avoiding argument count setup ([9123ef4](https://github.com/mruby/mruby/commit/9123ef4))
+- `OP_TDEF`/`OP_SDEF`: Fused method definition combining TCLASS/SCLASS+METHOD+DEF into single instruction, saving 4 bytes per method ([8d4f47e](https://github.com/mruby/mruby/commit/8d4f47e))
+- `OP_GETIDX0`: Fast path for `array[0]` and `Array#first` access ([680f7ec](https://github.com/mruby/mruby/commit/680f7ec))
+- `OP_ADDILV`/`OP_SUBILV`: Local variable increment/decrement fusion for `i += n` patterns ([43f64b9](https://github.com/mruby/mruby/commit/43f64b9))
+- `OP_RETSELF`: Single-byte instruction for `return self` pattern ([a71db8c](https://github.com/mruby/mruby/commit/a71db8c))
+- `OP_RETNIL`: Single-byte instruction for `return nil` pattern ([64e30bf](https://github.com/mruby/mruby/commit/64e30bf))
+- `OP_RETTRUE`/`OP_RETFALSE`: Single-byte instructions for `return true`/`return false` patterns ([0b15727](https://github.com/mruby/mruby/commit/0b15727))
+- `OP_MATCHERR`: Pattern matching error with conditional execution ([944168a](https://github.com/mruby/mruby/commit/944168a))
+- `OP_BLKCALL`: Direct block call for `yield`, bypassing method dispatch (13-17% faster) ([3aa2872](https://github.com/mruby/mruby/commit/3aa2872))
+
+Other optimizations:
+
+- 1.5x stack growth instead of linear growth for reduced reallocations ([f7988c93](https://github.com/mruby/mruby/commit/f7988c93))
+- Skip keyword argument hash duplication ([5970e350](https://github.com/mruby/mruby/commit/5970e350))
+
+# Fixed GitHub Issues
+
+- [#5531](https://github.com/mruby/mruby/issues/5531) Hash recursion detection
+- [#6506](https://github.com/mruby/mruby/issues/6506) Constant lookup in singleton class
+- [#6507](https://github.com/mruby/mruby/issues/6507) tally multi-values
+- [#6508](https://github.com/mruby/mruby/issues/6508) Enumerable#sum index
+- [#6509](https://github.com/mruby/mruby/issues/6509) scope_new nregs initialization
+- [#6515](https://github.com/mruby/mruby/issues/6515) y.tab.c in repository
+- [#6516](https://github.com/mruby/mruby/issues/6516) Private backquote
+- [#6554](https://github.com/mruby/mruby/issues/6554) Socket private #initialize
+- [#6570](https://github.com/mruby/mruby/issues/6570) instance_eval crash
+- [#6613](https://github.com/mruby/mruby/issues/6613) const_added hook during bootstrapping
+- [#6635](https://github.com/mruby/mruby/issues/6635), [#6636](https://github.com/mruby/mruby/issues/6636) Colon3 constant lookup
+- [#6637](https://github.com/mruby/mruby/issues/6637) arm64 mingw64 builtin setjmp/longjmp
+- [#6642](https://github.com/mruby/mruby/issues/6642) Task segfault when sleep called from C
+- [#6645](https://github.com/mruby/mruby/issues/6645) Set memory leak from double initialization
+- [#6646](https://github.com/mruby/mruby/issues/6646) IO#gets negative length
+- [#6647](https://github.com/mruby/mruby/issues/6647) IO#ungetc buffer overflow
+- [#6648](https://github.com/mruby/mruby/issues/6648) sprintf buffer overread
+- [#6649](https://github.com/mruby/mruby/issues/6649) Array#sort! use-after-realloc
+- [#6650](https://github.com/mruby/mruby/issues/6650) Array#fill validation
+- [#6652](https://github.com/mruby/mruby/issues/6652) Array comparison use-after-realloc
+- [#6657](https://github.com/mruby/mruby/issues/6657) Exception handling for ||= on class variables
+- [#6659](https://github.com/mruby/mruby/issues/6659) Super with keyword arguments
+- [#6660](https://github.com/mruby/mruby/issues/6660) Regression on struct/array/hash == override with super
+- [#6662](https://github.com/mruby/mruby/issues/6662) Array set operations use-after-free
+- [#6664](https://github.com/mruby/mruby/issues/6664) Set#flatten memory leak
+- [#6666](https://github.com/mruby/mruby/issues/6666) Regexp literal with encoding
+- [#6668](https://github.com/mruby/mruby/issues/6668) Method#== for aliased methods and comparison bug
+- [#6671](https://github.com/mruby/mruby/issues/6671) Separate inter-gem headers from external API headers
+- [#6674](https://github.com/mruby/mruby/issues/6674) Document pattern matching limitations
+- [#6675](https://github.com/mruby/mruby/issues/6675) Allow Hash#[] to be aliased again
+- [#6687](https://github.com/mruby/mruby/issues/6687) Expand MRB_SYM/MRB_GVSYM support for symbols with special characters
+- [#6698](https://github.com/mruby/mruby/issues/6698) Bigint tests fail on architectures other than x86_64 and i386
+- [#6701](https://github.com/mruby/mruby/issues/6701) Heap-use-after-free in mrb_vm_exec involving mruby-rational / mruby-bigint
+- [#6702](https://github.com/mruby/mruby/issues/6702) mruby-bigint doesn't compile in C++ project
+- [#6704](https://github.com/mruby/mruby/issues/6704) Heap-buffer-overflow in mrb_vm_exec via malformed source code
+- [#6705](https://github.com/mruby/mruby/issues/6705) Can't get outer class of an object in C
+- [#6713](https://github.com/mruby/mruby/issues/6713) mruby-polarssl not work
+- [#6720](https://github.com/mruby/mruby/issues/6720) Random float range: different behavior from CRuby
+- [#6722](https://github.com/mruby/mruby/issues/6722) RBreak size overflow on 32-bit platforms with MRB_NO_BOXING
+- [#6740](https://github.com/mruby/mruby/issues/6740) `%w()`/`%i()` register pressure with large literals
+- [#6741](https://github.com/mruby/mruby/issues/6741) `case`/`in` without `else` should raise `NoMatchingPatternError`
+- [#6760](https://github.com/mruby/mruby/issues/6760) `mrb_gc_unregister()` not removing all matching entries
+
+# Merged Pull Requests
+
+- [#6418](https://github.com/mruby/mruby/pull/6418) Add `ls-lint` with GitHub Actions
+- [#6492](https://github.com/mruby/mruby/pull/6492) fix a typo, update specs
+- [#6493](https://github.com/mruby/mruby/pull/6493) Fix TYPO in memory.md
+- [#6495](https://github.com/mruby/mruby/pull/6495) Remove `MRB_ENDIAN_LOHI()` that is no longer in use
+- [#6497](https://github.com/mruby/mruby/pull/6497) gha: update `build.yml` try `windows-2025` image
+- [#6498](https://github.com/mruby/mruby/pull/6498) Clean up and standardize the pre-commit config
+- [#6501](https://github.com/mruby/mruby/pull/6501) Update pre-commit Node.js version to `v22.14.0 LTS`
+- [#6502](https://github.com/mruby/mruby/pull/6502) pre-commit: update prettier to the latest version
+- [#6503](https://github.com/mruby/mruby/pull/6503) misc: fix typos
+- [#6505](https://github.com/mruby/mruby/pull/6505) mrbgems: fix spelling
+- [#6510](https://github.com/mruby/mruby/pull/6510) Fixed class method visibility via `module_function`
+- [#6511](https://github.com/mruby/mruby/pull/6511) Exclude the external project "lrama" from pre-commit
+- [#6513](https://github.com/mruby/mruby/pull/6513) mruby 3.4.0 released
+- [#6517](https://github.com/mruby/mruby/pull/6517) core/codegen.c: remove unneeded duplicate semicolon
+- [#6518](https://github.com/mruby/mruby/pull/6518) Change mrbc_args.flags bit width from 2 to 3
+- [#6519](https://github.com/mruby/mruby/pull/6519) Add `tools/lrama` to `.prettierignore`
+- [#6520](https://github.com/mruby/mruby/pull/6520) pre-commit: autoupdate and update node LTS version
+- [#6521](https://github.com/mruby/mruby/pull/6521) Add codespell config file `.codespellrc`
+- [#6522](https://github.com/mruby/mruby/pull/6522) gha: label more files
+- [#6523](https://github.com/mruby/mruby/pull/6523) add `rand(Range)` and unify implementations of `Random#rand` and `Kernel#rand`
+- [#6524](https://github.com/mruby/mruby/pull/6524) Fix Kernel#p when no argument
+- [#6525](https://github.com/mruby/mruby/pull/6525) Skip adding empty input to mirb history
+- [#6526](https://github.com/mruby/mruby/pull/6526) Add build config for Luckfox Pico embedded SBC
+- [#6528](https://github.com/mruby/mruby/pull/6528) misc: fix spelling
+- [#6530](https://github.com/mruby/mruby/pull/6530) Revert "class.c (find_visibility_scope): when callinfo returns, \*ep == NULL; #6512"
+- [#6531](https://github.com/mruby/mruby/pull/6531) Improve method table performance by rehashing at 75% load factor
+- [#6532](https://github.com/mruby/mruby/pull/6532) Reverted method table optimizations to prioritize memory savings
+- [#6533](https://github.com/mruby/mruby/pull/6533) Fix calling `extended` callback
+- [#6534](https://github.com/mruby/mruby/pull/6534) Add descriptive comment to mrb_read_float function
+- [#6535](https://github.com/mruby/mruby/pull/6535) Added descriptive comments for functions/macros in src/mempool.c
+- [#6536](https://github.com/mruby/mruby/pull/6536) Add descriptive comments to public functions in src/debug.c
+- [#6537](https://github.com/mruby/mruby/pull/6537) Updated comments in `cdump.c` to remove the `@brief` tag
+- [#6539](https://github.com/mruby/mruby/pull/6539) Add descriptive comments for functions in src/load.c
+- [#6540](https://github.com/mruby/mruby/pull/6540) Add descriptive comments to MRB_API functions in object.c
+- [#6541](https://github.com/mruby/mruby/pull/6541) Add descriptive comments for MRB_API functions in src/array.c
+- [#6542](https://github.com/mruby/mruby/pull/6542) Add descriptive comments to MRB_API functions in src/symbol.c
+- [#6543](https://github.com/mruby/mruby/pull/6543) Add descriptive comments to several functions in src/dump.c
+- [#6544](https://github.com/mruby/mruby/pull/6544) Fix build strings that must be mutable
+- [#6545](https://github.com/mruby/mruby/pull/6545) Add descriptive comments for MRB_API functions in src/class.c
+- [#6548](https://github.com/mruby/mruby/pull/6548) Add descriptive comments to MRB_API functions in src/etc.c
+- [#6549](https://github.com/mruby/mruby/pull/6549) Add descriptive comments to kernel functions
+- [#6550](https://github.com/mruby/mruby/pull/6550) Add descriptive comments for MRB_API functions in src/proc.c
+- [#6551](https://github.com/mruby/mruby/pull/6551) Add descriptive comments for MRB_API functions in src/state.c
+- [#6552](https://github.com/mruby/mruby/pull/6552) Fix: Correct placement of comments in src/variable.c
+- [#6553](https://github.com/mruby/mruby/pull/6553) Add descriptive comments for MRB_API functions in src/vm.c
+- [#6555](https://github.com/mruby/mruby/pull/6555) `mrb_mt_foreach()` needs to update the pointer at each loop
+- [#6556](https://github.com/mruby/mruby/pull/6556) `iv_foreach()` needs to update the pointer at each loop
+- [#6560](https://github.com/mruby/mruby/pull/6560) Refactor: Improve Set GC marking and freeing
+- [#6561](https://github.com/mruby/mruby/pull/6561) pre-commit updates and fix prettier entrypoint
+- [#6562](https://github.com/mruby/mruby/pull/6562) misc: fix spelling word case
+- [#6563](https://github.com/mruby/mruby/pull/6563) pre-commit add rubocop with one rule spaces for indentation
+- [#6564](https://github.com/mruby/mruby/pull/6564) Remove jumanjihouse pre-commit hooks no longer maintained
+- [#6565](https://github.com/mruby/mruby/pull/6565) Rubocop: fix target Ruby version; add two more cops; fix lint error
+- [#6566](https://github.com/mruby/mruby/pull/6566) Removed unreferenced variables in `CrossBuild#run_bintest`
+- [#6567](https://github.com/mruby/mruby/pull/6567) Avoid array object creation in `cmd_bin` method in bintest
+- [#6568](https://github.com/mruby/mruby/pull/6568) mruby-bin-debugger depends on mruby-bin-mrbc in bintest
+- [#6569](https://github.com/mruby/mruby/pull/6569) sed s/Mruby/MRuby/g
+- [#6571](https://github.com/mruby/mruby/pull/6571) Update limitations.md to add behavior on small hash
+- [#6572](https://github.com/mruby/mruby/pull/6572) Add Claude Code GitHub Workflow
+- [#6573](https://github.com/mruby/mruby/pull/6573) pre-commit fixes and updates
+- [#6574](https://github.com/mruby/mruby/pull/6574) Support initializing structs via keyword arguments
+- [#6575](https://github.com/mruby/mruby/pull/6575) Fix typo in file time methods
+- [#6581](https://github.com/mruby/mruby/pull/6581) Merge `mrb_obj_iv_inspect()` into `mrb_obj_inspect()`
+- [#6582](https://github.com/mruby/mruby/pull/6582) Stricter type tag in `mrb_obj_alloc()`
+- [#6583](https://github.com/mruby/mruby/pull/6583) Add fallback to local build_config.rb before using default configuration
+- [#6585](https://github.com/mruby/mruby/pull/6585) Fix typo in mruby3.2 docs
+- [#6586](https://github.com/mruby/mruby/pull/6586) Makefile: refactor add docs and add command line `help` target
+- [#6587](https://github.com/mruby/mruby/pull/6587) Add Set#hash tests
+- [#6588](https://github.com/mruby/mruby/pull/6588) Add CodeQL Analysis for GitHub Actions
+- [#6589](https://github.com/mruby/mruby/pull/6589) Add pre-commit hook `check-zip-file-is-not-committed`
+- [#6591](https://github.com/mruby/mruby/pull/6591) mruby-eval fix license link in README
+- [#6593](https://github.com/mruby/mruby/pull/6593) README: Add Contributors Avatars, Star History, Table of Contents
+- [#6598](https://github.com/mruby/mruby/pull/6598) Fix heap buffer overflow in `#method_missing`
+- [#6599](https://github.com/mruby/mruby/pull/6599) pre-commit: run `markdown-link-check`, `oxipng`, `prettier` manually
+- [#6600](https://github.com/mruby/mruby/pull/6600) `dreamcast_shelf build config`: update to use KallistiOS wrappers
+- [#6601](https://github.com/mruby/mruby/pull/6601) fix: skip local build_config.rb when working in MRUBY_ROOT
+- [#6602](https://github.com/mruby/mruby/pull/6602) Improved iseq annotations for `new` and `!=`
+- [#6604](https://github.com/mruby/mruby/pull/6604) pre-commit config updates
+- [#6607](https://github.com/mruby/mruby/pull/6607) fix bigint on raspberry pi
+- [#6610](https://github.com/mruby/mruby/pull/6610) Extract golden ratio prime into constant
+- [#6614](https://github.com/mruby/mruby/pull/6614) Fix uninitialized variable in io_gets causing segmentation fault
+- [#6617](https://github.com/mruby/mruby/pull/6617) Fix various minor problems and speed up build
+- [#6618](https://github.com/mruby/mruby/pull/6618) Stop generating unnecessary C++ files in mruby-bin-mruby
+- [#6621](https://github.com/mruby/mruby/pull/6621) Set up all GEMS before mruby core tasks definition
+- [#6624](https://github.com/mruby/mruby/pull/6624) Fixed wrong `MRuby::Build.current` at the top level of `mrbgem.rake`
+- [#6628](https://github.com/mruby/mruby/pull/6628) Revert `File.absolute_path` logic
+- [#6629](https://github.com/mruby/mruby/pull/6629) pre-commit update
+- [#6631](https://github.com/mruby/mruby/pull/6631) Revert "Rakefile: make the whole thing parallel unless SERIAL=1"
+- [#6633](https://github.com/mruby/mruby/pull/6633) Fix a heap-buffer-overflow in str strip! methods
+- [#6643](https://github.com/mruby/mruby/pull/6643) Fix crash caused by an incorrect node type check in `codegen_masgn`
+- [#6651](https://github.com/mruby/mruby/pull/6651) Address stack-use-after-return in the mruby bigint implementation
+- [#6653](https://github.com/mruby/mruby/pull/6653) Improve HAL-related components for MinGW
+- [#6655](https://github.com/mruby/mruby/pull/6655) Preventing Memory Leaks in `Array#__combination_init`
+- [#6656](https://github.com/mruby/mruby/pull/6656) Fix integer overflow in allocation size calculation
+- [#6663](https://github.com/mruby/mruby/pull/6663) Added the `kh_is_end()` macro function
+- [#6665](https://github.com/mruby/mruby/pull/6665) Fixed use-after-free with `Set#join`
+- [#6670](https://github.com/mruby/mruby/pull/6670) Arranging VM dispatch macros
+- [#6673](https://github.com/mruby/mruby/pull/6673) Adjust broken license links; clean up Markdown
+- [#6677](https://github.com/mruby/mruby/pull/6677) gha: run pre-commit with `--color=always`
+- [#6678](https://github.com/mruby/mruby/pull/6678) Put ls-lint and pre-commit in separate workflow files
+- [#6679](https://github.com/mruby/mruby/pull/6679) pre-commit autoupdate; update node and prettier
+- [#6681](https://github.com/mruby/mruby/pull/6681) Add Cosmopolitan Libc build configuration
+- [#6689](https://github.com/mruby/mruby/pull/6689) docs: fix pre-commit manual hooks; fix link
+- [#6694](https://github.com/mruby/mruby/pull/6694) Fix mirb build under Cosmopolitan
+- [#6695](https://github.com/mruby/mruby/pull/6695) Dependabot: add a cooldown period for new releases
+- [#6696](https://github.com/mruby/mruby/pull/6696) Fix parse error with required kwargs and omitted parens
+- [#6699](https://github.com/mruby/mruby/pull/6699) Fix mruby-task for PicoRuby Integration
+- [#6700](https://github.com/mruby/mruby/pull/6700) Fix float/double pack/unpack on s390x
+- [#6706](https://github.com/mruby/mruby/pull/6706) Refactor task class to use symbol IDs
+- [#6708](https://github.com/mruby/mruby/pull/6708) `initialize_copy` and `respond_to_missing?` defined as private
+- [#6709](https://github.com/mruby/mruby/pull/6709) Add the `MRB_ENSURE()` macro
+- [#6711](https://github.com/mruby/mruby/pull/6711) Fix out of bounds read and write in IO.select
+- [#6714](https://github.com/mruby/mruby/pull/6714) Fix OP_DEBUG operand type and add NULL check for debug_op_hook
+- [#6716](https://github.com/mruby/mruby/pull/6716) Fixes identity for proc object
+- [#6717](https://github.com/mruby/mruby/pull/6717) Fix mruby-task: wrapping by critical section and setting initial task receiver
+- [#6718](https://github.com/mruby/mruby/pull/6718) Add installation instructions for conda and Homebrew
+- [#6723](https://github.com/mruby/mruby/pull/6723) Add `RInteger` and `RFloat` to `RVALUE`
+- [#6727](https://github.com/mruby/mruby/pull/6727) Language documentation: update wording of "overloading" section
+- [#6729](https://github.com/mruby/mruby/pull/6729) Simplifying dependency addition for gensym task
+- [#6730](https://github.com/mruby/mruby/pull/6730) Simplifying presym file generation actions
+- [#6733](https://github.com/mruby/mruby/pull/6733) Include `mruby/presym.h` for all source files
+- [#6734](https://github.com/mruby/mruby/pull/6734) Chunk array literals at 64 elements to reduce register pressure
+- [#6735](https://github.com/mruby/mruby/pull/6735) Prevent full recompilation without changes to presym file
+- [#6739](https://github.com/mruby/mruby/pull/6739) Fix MSYS2 build error with drive letters
+- [#6743](https://github.com/mruby/mruby/pull/6743) Chunk `%w()` and `%i()` literals to reduce register pressure
+- [#6744](https://github.com/mruby/mruby/pull/6744) Raise `NoMatchingPatternError` in `case`/`in` without `else`
+- [#6747](https://github.com/mruby/mruby/pull/6747) Correctly handle empty hash as default named argument
+- [#6749](https://github.com/mruby/mruby/pull/6749) Fix microcontroller profile
+- [#6750](https://github.com/mruby/mruby/pull/6750) Fix out-of-bounds read and divide-by-zero in `Array#product`
+- [#6752](https://github.com/mruby/mruby/pull/6752) Fix `attr_reader`-generated methods accepting extra arguments
+- [#6753](https://github.com/mruby/mruby/pull/6753) Further optimize `Array#product`
+- [#6754](https://github.com/mruby/mruby/pull/6754) Mark `attr_reader` procs as noarg
+- [#6755](https://github.com/mruby/mruby/pull/6755) Reload `ci` after `mrb_hash_delete_key()` in keyword argument handling
+- [#6756](https://github.com/mruby/mruby/pull/6756) Avoid impact of object modifications caused by `mrb_vm_exec()` calls
+- [#6758](https://github.com/mruby/mruby/pull/6758) Don't assign result of `mrb_funcall()` directly to `regs`
+- [#6759](https://github.com/mruby/mruby/pull/6759) Define `mrb_bigint_p()` always
+- [#6761](https://github.com/mruby/mruby/pull/6761) Fix `mrb_gc_unregister()` to remove all matching entries
+- [#6762](https://github.com/mruby/mruby/pull/6762) Write generated test C files atomically to avoid build race condition
+- [#6765](https://github.com/mruby/mruby/pull/6765) Fix `Lazy#flat_map` to handle non-enumerable block return values
+- [#6767](https://github.com/mruby/mruby/pull/6767) Allow compound statement in parenthesized argument context
+- [#6780](https://github.com/mruby/mruby/pull/6780) Fix `String#prepend` with self-referencing arguments
+- [#6781](https://github.com/mruby/mruby/pull/6781) Protect `sprintf` format string from mutation during callbacks
+- [#6783](https://github.com/mruby/mruby/pull/6783) Pin GitHub Actions workflows to commit hashes
+
+# Security Fixes
+
+- Buffer overflow in bigint uadd ([3f2611e](https://github.com/mruby/mruby/commit/3f2611e))
+- Stack buffer overflow in Montgomery reduction ([edce0a3](https://github.com/mruby/mruby/commit/edce0a3))
+- Buffer overflow in pack_uu encoding ([2993302](https://github.com/mruby/mruby/commit/2993302))
+- Buffer overflow in IO#ungetc ([01ab2ff](https://github.com/mruby/mruby/commit/01ab2ff))
+- Heap-buffer-overflow in pattern alternation codegen ([eea9e30](https://github.com/mruby/mruby/commit/eea9e30))
+- Out of bounds read and write in IO.select ([44831711](https://github.com/mruby/mruby/commit/44831711))
+- Off-by-one in bounds check for symbol names and pool strings in load.c ([b3b8c01](https://github.com/mruby/mruby/commit/b3b8c01))
+- Use-after-free in Set operations ([a6b55e7](https://github.com/mruby/mruby/commit/a6b55e7))
+- Use-after-free in Array set operations ([729b84c](https://github.com/mruby/mruby/commit/729b84c))
+- Use-after-free in Set#join ([0e653eb](https://github.com/mruby/mruby/commit/0e653eb))
+- Use-after-realloc in Array#sort! ([eb39897](https://github.com/mruby/mruby/commit/eb39897))
+- Heap-use-after-free in insertion_sort ([099d2c47](https://github.com/mruby/mruby/commit/099d2c47))
+- Integer overflow in str_check_length ([6afff1c3](https://github.com/mruby/mruby/commit/6afff1c3))
+- Integer overflow in Integer#lcm ([070bef24](https://github.com/mruby/mruby/commit/070bef24))
+- Heap buffer overflow in `#method_missing` ([550d10a](https://github.com/mruby/mruby/commit/550d10a))
+- Out-of-bounds read and divide-by-zero in `Array#product` ([8441eaf](https://github.com/mruby/mruby/commit/8441eaf))
+- Heap buffer overflow in `String#prepend` with self-referencing arguments ([18ba026](https://github.com/mruby/mruby/commit/18ba026))
+- Use-after-free in `sprintf` via `to_s` callback mutating format string ([48fc422](https://github.com/mruby/mruby/commit/48fc422))
+- Multiple memory leak fixes in bigint, Set, Array, and Task gems
@@ -80,7 +80,7 @@ MRB_BEGIN_DECL
 /*
 * Release year.
 */
-#define MRUBY_RELEASE_YEAR 2025
+#define MRUBY_RELEASE_YEAR 2026

 /*
 * Release month.