1.17.1

Bugfixes

tools

• (docs-generator) [regression] Revert "Handle doc locations when file is in parent directory" (#15996, thanks @Blacksmoke16)

Infrastructure

• Changelog for 1.17.1 (#16009, thanks @straight-shoota)

1.17.0

Breaking changes

stdlib

• Make Colorize.on_tty_only! the default behavior (#15881, thanks @HertzDevil)
• (concurrency) Rename execution contexts + improve their docs (#15936, thanks @ysbaddaden)
• (files) Refactor IO.pipe blocking mode (#15823, thanks @ysbaddaden)
• (files) Fix: set IO::Stapled.pipe blocking args to nil, as per IO.pipe (#15925, thanks @ysbaddaden)
• (networking) Refactor Socket blocking mode (#15804, thanks @ysbaddaden)
• (runtime) Let the event loop decide the blocking mode of File (#15930, thanks @ysbaddaden)
• (serialization) Fix: libxml manual memory management (#15906, #15933, thanks @ysbaddaden)
• (system) Turn SystemError.from_errno into a macro (#15874, thanks @straight-shoota)

Features

lang

• (macros) Handle properly stringifying single line blocks (#15568, thanks @Blacksmoke16)
• (macros) Handle properly stringifying multiline named tuple literals (#15566, thanks @Blacksmoke16)
• (macros) Handle properly stringifying multiline calls (#15691, thanks @Blacksmoke16)
• (macros) Handle significant whitespace before a blocks body (#15692, thanks @Blacksmoke16)
• (macros) Support {% if ...; end; ... %} macro expressions (#15917, thanks @HertzDevil)
• (macros) Support {% elsif %} when stringifying MacroIf nodes (#15928, thanks @HertzDevil)

stdlib

• Add Colorize.default_enabled? (#15912, thanks @HertzDevil)
• [experimental] Add Struct.pre_initialize (#15896, thanks @HertzDevil)
• (files) Support Windows local device paths in Path (#15590, thanks @HertzDevil)
• (llvm) Support LLVM 21.0 (development branch) (#15771, thanks @HertzDevil)
• (networking) Extract WebSocket#do_ping, #do_close helper methods for overrides (#15545, thanks @luislavena)
• (networking) Add support for IPv6 scoped addresses (RFC4007) (#15263, thanks @foxxx0)
• (networking) Expose HTTP::Request#uri (#15816, thanks @syeopite)
• (numeric) Add BigRational#to_i (#15809, thanks @HertzDevil)
• (numeric) Add Float::Primitive#sign_bit (#15830, thanks @HertzDevil)
• (runtime) Add explicit Crystal::EventLoop#reopened(FileDescriptor) hook (#15640, thanks @ysbaddaden)
• (runtime) Add Crystal::EventLoop::FileDescriptor#open (#15750, thanks @ysbaddaden)
• (runtime) Add Thread::Local(T) (#15616, thanks @ysbaddaden)
• (serialization) Add XML.libxml2_version (#15623, thanks @straight-shoota)
• (serialization) Add YAML::Builder#start_document(*, implicit_start_indicator) (#15835, thanks @straight-shoota)
• (serialization) Support pretty printing of XML types (#15833, thanks @HertzDevil)
• (serialization) Expose error message from libyaml on emitter errors (#15841, thanks @straight-shoota)
• (serialization) Add Path.from_json_object_key (#15877, thanks @jneen)
• (serialization) Add Time::Location#{to,from}_{json,yaml} (#15939, thanks @Sija)
• (serialization) Extract XML::Document from XML::Node (#15920, thanks @ysbaddaden)
• (text) [experimental] Add Crystal::System.wstr_literal on Windows (#15747, thanks @HertzDevil)
• (text) Add String#ensure_suffix and String#ensure_prefix (#15782, thanks @MatheusRich)
• (text) Add truncate_at_null parameter to String.new(Bytes) and .from_utf16 (#15887, thanks @HertzDevil)
• (time) Add Time.month_week_date (#15620, thanks @HertzDevil)
• (time) Improve the TZif database file parser (#15825, thanks @HertzDevil)
• (time) Support POSIX TZ environment variable strings (#15792, thanks @HertzDevil)
• (time) Improve whitespace handling in Time::Format (#15890, thanks @HertzDevil)
• (time) Support Windows system time zone transitions in all years (#15891, thanks @HertzDevil)
• (time) Support POSIX TZ strings in TZif databases (#15863, thanks @HertzDevil)

compiler

• (cli) Support --x86-asm-syntax for emitting Intel style assembly (#15612, thanks @HertzDevil)
• (debugger) Support debug info of 128-bit enum members (#15770, thanks @HertzDevil)
• (parser) More robust trailing expressions newline implementation (#15614, thanks @Blacksmoke16)
• (parser) Handle properly stringifying multiline (boolean) expressions (#15709, thanks @Blacksmoke16)
• (parser) Stringify MacroIf unless nodes properly (#15919, thanks @HertzDevil)
• (parser) Support elsif when stringifying If nodes (#15918, thanks @HertzDevil)
• (parser) Add location info to MacroVar nodes (#15947, thanks @Blacksmoke16)
• (semantic) Improve error message for pointerof (#15876, thanks @straight-shoota)

tools

• Macro code coverage tool (#15738, thanks @Blacksmoke16)
• (docs-generator) Limit paragraph max-width in API docs (#15672, thanks @straight-shoota)

Bugfixes

lang

• [experimental] Do not use private linkage for slice literal buffers (#15746, thanks @HertzDevil)

stdlib

• Require NO_COLOR to be non-empty ([#15880], thanks @HertzDevil)
• (benchmark) Use UInt64 to track iteration count during warm-up calculation in Benchmark::IPS ([#15780], thanks @syeopite)
• (collection) Fix Array#| for different item types ([#15756], thanks @straight-shoota)
• (concurrency) Fix calling Fiber::ExecutionContext#enqueue from bare Thread ([#15767], thanks @ysbaddaden)
• (concurrency) Simplify Crystal::System::Fiber::RESERVED_STACK_SIZE initializer on Windows ([#15820], thanks @HertzDevil)
• (concurrency) Do not print adjacent nodes in Thread::LinkedList#inspect ([#15829], thanks @HertzDevil)
• (files) Fix async append to file in IOCP ([#15681], thanks @ysbaddaden)
• (numeric) [regression] Fix BigFloat#format not compiling ([#15796], thanks @HertzDevil)
• (numeric) Never output exponent in BigDecimal#format ([#15795], thanks @HertzDevil)
• (numeric) Preserve precision when passing BigDecimal or BigFloat to sprintf %i ([#15808], thanks @HertzDevil)
• (numeric) Fix Float32#abs for signed zeros ([#15814], thanks @HertzDevil)
• (numeric) Ensure unary Float32#- and Float64#- flip sign bit ([#15857], thanks @HertzDevil)
• (runtime) reopen async File passed to Process.exec and .run (win32) ([#15703], thanks @ysbaddaden)
• (runtime) raise on manual fiber resume from sleep ([#15744], thanks @ysbaddaden)
• (runtime) race condition in Fiber::ExecutionContext::Isolated#wait ([#15872], thanks @ysbaddaden)
• (runtime) Prevent leaking memory when exec_recursive's block r...

1.16.3

Bugfixes

stdlib

• (runtime) Fix Crystal::EventLoop::LibEvent and FiberExecutionContext integration (#15759, backported from #15743, thanks @ysbaddaden)

compiler

• (codegen) Add fallback if __crystal_raise_cast_failed is missing (#15769, backported from #15762, thanks @HertzDevil)
• (semantic) [regression] Remove type binding on T for Pointer(T)#value= (#15757, backported from #15751, thanks @HertzDevil)

Infrastructure

• Changelog for 1.16.3 (#15758, thanks @straight-shoota)

1.16.2

Bugfixes

stdlib

• (numeric) Fix show unit_separator in #humanize_bytes with empty prefix (#15717, backported from #15683, thanks @straight-shoota)
• (runtime) CRYSTAL_LOAD_DEBUG_INFO=1 fails with -Dexecution_context (#15715, backported from #15704, thanks @ysbaddaden)
• (runtime) Fix -Dtracing raises math overflows on fiber sleep (#15725, backported from #15722, thanks @ysbaddaden)
• (runtime) Fix Fiber::ExecutionContext::Isolated#wait must suspend fiber (#15723, backported from #15720, thanks @ysbaddaden)
• (runtime) Fix run win32 console reader in bare thread (#15726, backported from #15724, thanks @ysbaddaden)

compiler

• (semantic) Do not add ReferenceStorage to Value's subclasses twice (#15718, backported from #15706, thanks @HertzDevil)

Refactor

compiler

• (codegen) Add __crystal_raise_cast_failed for non-interpreted code (#15712, backported from #15708, thanks @HertzDevil)

Infrastructure

• Changelog for 1.16.2 (#15716, thanks @straight-shoota)
• (ci) Fix package shards on MinGW (#15719, thanks @straight-shoota)
• (ci) Only set up Cygwin on Windows CI if truly required (#15713, backported from #15661, thanks @HertzDevil)

1.16.1

Bugfixes

stdlib

• (runtime) Correctly transfer FD ownership in polling event loop (#15650, thanks @ysbaddaden)
• (runtime) Fix error message when PollDescriptor can't transfer fd (#15663, thanks @ysbaddaden)
• (runtime) Fix libgc pkg-config name for version discovery (#15636, thanks @straight-shoota)
• (serialization) [regression] Fix link bcrypt with libxml2 on Windows (#15651, thanks @straight-shoota)

compiler

• (cli) [regression] Fix crystal eval read from stdin (#15655, thanks @straight-shoota)

Documentation

stdlib

• (runtime) Enable docs for ExecutionContext (#15644, thanks @straight-shoota)
• (runtime) Fix mark method overrides on ExecutionContext as :nodoc: (#15659, thanks @ysbaddaden)
• (runtime) Update docs for Fiber::ExecutionContext.default_workers_count (#15664, thanks @ysbaddaden)
• (runtime) Enhance documentation for ExecutionContext (#15665, thanks @straight-shoota)

Infrastructure

• Changelog for 1.16.1 (#15666, thanks @straight-shoota)

1.16.0

Features

lang

• Support Slice.literal in the interpreter (#15531, thanks @HertzDevil)
• Support Slice.literal with inferred element type (#15529, thanks @HertzDevil)
• (macros) Error on TypeNode#instance_vars, #has_inner_pointers? macros in top-level scope (#15293, thanks @straight-shoota)
• (macros) Support sizeof and alignof inside macros for stable types (#15497, thanks @HertzDevil)

stdlib

• Fix Box(Pointer).box to not allocate pointer storage on the heap (#15562, thanks @ysbaddaden)
• (collection) Add Indexable#find and #find! (#15552, #15589, thanks @punteek, @Sija)
• (llvm) Add LLVM.version (#15354, thanks @straight-shoota)
• (llvm) Support LLVM 20 (#15412, #15418, thanks @HertzDevil, @straight-shoota)
• (llvm) Add LLVM.init_native_target and LLVM.init_all_targets (#15466, thanks @HertzDevil)
• (llvm) Support $LLVM_VERSION, $LLVM_TARGETS, and $LLVM_LDFLAGS (#15091, thanks @HertzDevil)
• (llvm) Add LLVM::CodeModel::Tiny (#15608, thanks @HertzDevil)
• (macros) Implement StringLiteral#scan (#15398, thanks @homonoidian)
• (networking) Add Path as possible argument type to UNIXSocket and UNIXServer (#15260, thanks @BigBoyBarney)
• (networking) Add Cookies#== (#15463, thanks @straight-shoota)
• (runtime) Add EventLoop#wait_readable, #wait_writable methods methods (#15376, thanks @ysbaddaden)
• (runtime) Initialize Fiber with an explicit stack (#15409, thanks @ysbaddaden)
• (runtime) Add fiber queues for execution context schedulers (#15345, thanks @ysbaddaden)
• (runtime) RFC 2: Skeleton for ExecutionContext (#15350, #15596, thanks @ysbaddaden)
• (runtime) RFC 2: Add Fiber::ExecutionContext::SingleThreaded scheduler (#15511, thanks @ysbaddaden)
• (runtime) RFC 2: Add Fiber::ExecutionContext::Isolated (#15513, thanks @ysbaddaden)
• (runtime) RFC 2: Add Fiber::ExecutionContext::Monitor (#15599, thanks @ysbaddaden)
• (runtime) RFC 2: Add Fiber::ExecutionContext::MultiThreaded (#15517, thanks @ysbaddaden)
• (serialization) Add Union.from_json_object_key? (#15411, thanks @straight-shoota)
• (system) Add Process::Status#description (#15468, thanks @straight-shoota)
• (text) Add IO overloads to Char#upcase, #downcase, #titlecase (#15508, thanks @HertzDevil)
• (text) [breaking] New algorithm for File.match? (#15607, thanks @straight-shoota)

compiler

• (cli) Support --output long option in crystal build (#15519, thanks @HertzDevil)
• (cli) Support directory name in --output CLI option (#15471, thanks @straight-shoota)
• (cli) [breaking] Add compiler path to $PATH and $CRYSTAL_EXEC_PATH for subcommands (#15186, thanks @straight-shoota)
• (cli) Respect --mcpu=help in the compiler (#15595, thanks @HertzDevil)
• (cli) Add CRYSTAL_EXEC_PATH to crystal env [followup #15186] (#15632, thanks @straight-shoota)
• (codegen) Set linkage of __crystal_* funs to internal (#15439, thanks @ysbaddaden)
• (codegen) Add function name to CRYSTAL_DEBUG_CODEGEN log helper (#15506, thanks @HertzDevil)
• (parser) Handle properly stringifying multiline macro expressions (#15305, thanks @Blacksmoke16)
• (parser) [breaking] Check that def, macro, and block parameters don't end with ? or ! (#12197, thanks @potomak)

tools

• (docs-generator) Add docs to enum member helper methods (#15379, thanks @nobodywasishere)
• (docs-generator) Add :showdoc: directive for private and protected objects (RFC #11) (#15337, thanks @nobodywasishere)
• (docs-generator) Add documentation support for lib, fun, union, cstruct, external, and type (RFC #11) (#15447, thanks @nobodywasishere)

Bugfixes

stdlib

• (collection) Fix hash @indices can grow larger than Int32::MAX bytes (#15347, thanks @ysbaddaden)
• (collection) Fix Tuple#to_a(&) for arbitrary block output type (#15431, thanks @straight-shoota)
• (collection) Fix Range#size for unsigned edge cases (#14978, thanks @straight-shoota)
• (collection) [breaking] Fix the return type of Enumerable#sum, #product for union elements (#15314, thanks @rvprasad)
• (concurrency) Fix Reference#exec_recursive, #exec_recursive_clone to be fiber aware (#15361, thanks @ysbaddaden)
• (concurrency) RFC 2: MT safe fiber context switch on ARM (#15582, thanks @ysbaddaden)
• (crypto) Fix argument type for EVP_CIPHER_get_flags (#15392, thanks @miry)
• (files) Never remove UNC share name in Path#dirname (#15583, thanks @HertzDevil)
• (files) Fix File.exists? for special devices on Windows (#15587, thanks @HertzDevil)
• (llvm) Fix LLVM version detection for -rc1 (#15410, thanks @HertzDevil)
• (networking) [breaking] Fix parsing HTTP resource string that looks like absolute URL (#15499, thanks @straight-shoota)
• (runtime) Fix pkg_config name for libgc bindings on FreeBSD (#15532, thanks @straight-shoota)
• (runtime) RFC 2: MT safe fiber context switch on AArch64 (#15581, thanks @ysbaddaden)
• (runtime) Add thread safety to at_exit (#15598, thanks @ysbaddaden)
• (runtime) Remove top-level calls to LibGC.has_method? for backwards compat (#15635, thanks @straight-shoota)
• (serialization) Fix Union.from_yaml to prioritize String for quoted scalar (#15405, thanks @straight-shoota)
• (system) signal handler mustn't depend on the event loop (#15325, thanks @ysbaddaden)
• (system) Corrects Windows lib lookup in case-sensitive OSes (#15362, thanks @luislavena)
• (system) Fix permissions application in File.copy (#15520, thanks @straight-shoota)
• (system) [security] Strip periods, spaces for batch file filtering on Windows (#15573, thanks @GeopJr)
• (system) Extend Windows Process completion key's lifetime (#15597, thanks @HertzDevil)

compiler

• (cli) Fix query runtime version of LLVM ([#15355], thanks @straight-shoota)
• (cli)...

1.15.1

Bugfixes

stdlib

• (networking) Disable directory path redirect when directory_listing=false (#15393, thanks @straight-shoota)
• (runtime) [regression] abstract EventLoop::Polling#system_add invalid signature (#15380, backported from #15358, thanks @straight-shoota)
• (system) [regression] Fix GC sig_suspend, sig_resume for gc_none (#15382, backported from #15349, thanks @ysbaddaden)

Documentation

stdlib

• (system) Fix code example in Process::Status#exit_code docs (#15381, backported from #15351, thanks @zw963)

Infrastructure

• Changelog for 1.15.1 (#15406, thanks @straight-shoota)
• Update distribution-scripts (#15385, backported from #15368, thanks @straight-shoota)
• Update distribution-scripts (#15388, thanks @straight-shoota)
• Add backports to changelog generator (#15402, thanks @straight-shoota)
• (ci) Add build shards to mingw-w64 workflow (#15344, thanks @straight-shoota)
• (ci) Update shards 0.19.1 (#15384, backported from #15366, thanks @straight-shoota)
• (ci) Add check for shards binary in test_dist_linux_on_docker (#15394, thanks @straight-shoota)

1.15.0

Breaking changes

lang

• Allow constants to start with non-ascii uppercase and titlecase (#15148, thanks @nanobowers)

Features

lang

• (macros) Crystal Not operators do not need parens for stringification (#15292, thanks @Blacksmoke16)
• (macros) Add MacroIf#is_unless? AST node method (#15304, thanks @Blacksmoke16)

stdlib

• (collection) Add Iterator(T).empty (#15039, thanks @spuun)
• (collection) Add Enumerable#find_value (#14893, thanks @jgaskins)
• (concurrency) Implement the ARM64 Windows context switch (#15155, thanks @HertzDevil)
• (concurrency) Add optional name parameter forward to WaitGroup#spawn (#15189, thanks @spuun)
• (crypto) Enable bindings for functions in LibreSSL (#15177, thanks @straight-shoota)
• (log) Add Log overloads for logging exceptions without giving a block (#15257, thanks @lachlan)
• (networking) Better handle explicit chunked encoding responses (#15092, thanks @Blacksmoke16)
• (networking) Support OpenSSL on MSYS2 (#15111, thanks @HertzDevil)
• (networking) Add Socket::Address.from without addrlen (#15060, thanks @mamantoha)
• (networking) Add stringification for HTTP::Cookie (#15240, thanks @straight-shoota)
• (networking) Add stringification for HTTP::Cookies (#15246, thanks @straight-shoota)
• (networking) Add HTTP::Cookie#expire (#14819, thanks @a-alhusaini)
• (numeric) Implement fast_float for String#to_f (#15195, thanks @HertzDevil)
• (runtime) Support call stacks for MinGW-w64 builds (#15117, thanks @HertzDevil)
• (runtime) Support MSYS2's CLANGARM64 environment on ARM64 Windows (#15159, thanks @HertzDevil)
• (runtime) Improve Crystal::Tracing (#15297, thanks @ysbaddaden)
• (runtime) Add Thread#internal_name= (#15298, thanks @ysbaddaden)
• (runtime) Add Thread::LinkedList#each to safely iterate lists (#15300, thanks @ysbaddaden)
• (system) Add Process::Status#exit_code? (#15247, thanks @straight-shoota)
• (system) Add Process::Status#abnormal_exit? (#15266, thanks @straight-shoota)
• (system) Improve Process::Status#to_s for abnormal exits on Windows (#15283, thanks @straight-shoota)
• (system) Add Process::Status#exit_signal? (#15284, thanks @straight-shoota)
• (system) Change Process::Status#to_s to hex format on Windows (#15285, thanks @straight-shoota)
• (system) Add Process::Status#system_exit_status (#15296, thanks @straight-shoota)
• (text) Add Regex::CompileOptions::MULTILINE_ONLY (#14870, thanks @ralsina)
• (text) Add type restrictions to Levenshtein (#15168, thanks @beta-ziliani)
• (text) Add unit_separator to Int#humanize and #humanize_bytes (#15176, thanks @CTC97)
• (text) Add String#byte_index(Regex) (#15248, thanks @Zeljko-Predjeskovic)
• (text) Add Colorize::Object#ansi_escape (#15113, thanks @devnote-dev)

compiler

• Basic MinGW-w64 cross-compilation support (#15070, #15219, thanks @HertzDevil, @BlobCodes)
• (cli) Support building from a MinGW-w64-based compiler (#15077, thanks @HertzDevil)
• (codegen) Add indirect branch tracking (#15122, thanks @ysbaddaden)
• (codegen) Emit position dependent code for embedded targets (#15174, thanks @RX14)
• (interpreter) Support "long format" DLL import libraries (#15119, thanks @HertzDevil)
• (interpreter) Add cc's search paths to Unix dynamic library loader (#15127, thanks @HertzDevil)
• (interpreter) Basic MinGW-w64-based interpreter support (#15140, thanks @HertzDevil)
• (parser) Add ECR::Lexer::SyntaxException with location info (#15222, thanks @nobodywasishere)

tools

• (formatter) Enable pending formatter features (#14718, thanks @Blacksmoke16)
• (unreachable) Implement codecov format for unreachable tool (#15059, thanks @Blacksmoke16)

Bugfixes

lang

• (macros) Add location information to more MacroIf related nodes (#15100, thanks @Blacksmoke16)

stdlib

• LibC bindings and std specs on NetBSD 10 (#15115, thanks @ysbaddaden)
• (files) Treat WinError::ERROR_DIRECTORY as an error for non-existent files (#15114, thanks @HertzDevil)
• (files) Replace handle atomically in IO::FileDescriptor#close on Windows (#15165, thanks @HertzDevil)
• (llvm) Fix find-llvm-config to ignore LLVM_CONFIG's escape sequences (#15076, thanks @HertzDevil)
• (log) [regression] Fix Log to emit with exception even if block outputs nil (#15253, thanks @lachlan)
• (macros) Avoid identifier naming collision in getter, setter, and property macros (#15239, thanks @jgaskins)
• (networking) [regression] Fix UNIXSocket#receive (#15107, thanks @straight-shoota)
• (numeric) Fix Complex#/ edge cases (#15086, thanks @HertzDevil)
• (numeric) Fix Number#humanize printing of (-)Infinity and NaN (#15090, thanks @lachlan)
• (runtime) Fix Deadlock with parallel stop-world/fork calls in MT (#15096, thanks @ysbaddaden)
• (runtime) [regression] Protect constant initializers with mutex on Windows (#15134, thanks @HertzDevil)
• (runtime) use uninitialized LibC::SigsetT (#15144, thanks @straight-shoota)
• (runtime) Fix static linking when using MinGW-w64 (#15167, thanks @HertzDevil)
• (runtime) register GC callbacks inside GC.init (#15278, thanks @ysbaddaden)
• (runtime) Cleanup nodes in Thread::LinkedList(T)#delete (#15295, thanks @ysbaddaden)
• (runtime) Make Crystal::EventLoop#remove(io) a class method (#15282, thanks @ysbaddaden)
• (system) Raise on abnormal exit in Procss::Status#exit_code ([#15241], thanks @straight-shoota)
• (system) Fix Process::Status for unknown signals ([#15280], thanks @straight-shoota)
• (system) Fix error handling for LibC.clock_gettime(CLOCK_MONOTONIC) calls ([#15309], thanks @compumike)
• (text) Fix libiconv build on Windows ([#15095], thanks @HertzDevil)
• (text) Change sprintf "%c" to support only Char and Int::Primitive ([#15142], thanks @nanobowers)
• (time) Fix proper error handling for early end in HTTP_DATE parser ([#15232], thanks @straight-shoota)

[#1...

1.14.1

Bugfixes

tools

• (formatter) Handle trailing comma with multiple parameters on the same line (#15097, thanks @Blacksmoke16)

Infrastructure

• Changelog for 1.14.1 (#15323, thanks @straight-shoota)
• (ci) Update XCode 15.3.0 in circleci (#15327, thanks @straight-shoota)

1.14.0

Features

lang

• Allow ^ in constant numeric expressions (#14951, thanks @HertzDevil)

stdlib

• Add support for Windows on aarch64 (#14911, thanks @HertzDevil)
• (collection) [breaking] Add support for negative start index in Slice#[start, count] (#14778, thanks @ysbaddaden)
• (collection) Add Slice#same? (#14728, thanks @straight-shoota)
• (concurrency) Add WaitGroup.wait and WaitGroup#spawn (#14837, thanks @jgaskins)
• (concurrency) Open non-blocking regular files as overlapped on Windows (#14921, thanks @HertzDevil)
• (concurrency) Support non-blocking File#read and #write on Windows (#14940, thanks @HertzDevil)
• (concurrency) Support non-blocking File#read_at on Windows (#14958, thanks @HertzDevil)
• (concurrency) Support non-blocking Process.run standard streams on Windows (#14941, thanks @HertzDevil)
• (concurrency) Support IO::FileDescriptor#flock_* on non-blocking files on Windows (#14943, thanks @HertzDevil)
• (concurrency) Emulate non-blocking STDIN console on Windows (#14947, thanks @HertzDevil)
• (concurrency) Async DNS resolution on Windows (#14979, thanks @HertzDevil)
• (crypto) Update LibCrypto bindings for LibreSSL 3.5+ (#14872, thanks @straight-shoota)
• (llvm) Expose LLVM instruction builder for neg and fneg (#14774, thanks @JarnaChao09)
• (llvm) [experimental] Add minimal LLVM OrcV2 bindings (#14887, thanks @HertzDevil)
• (llvm) Add LLVM::Builder#finalize (#14892, thanks @JarnaChao09)
• (llvm) Support LLVM 19.1 (#14842, thanks @HertzDevil)
• (macros) Add Crystal::Macros::TypeNode#has_inner_pointers? (#14847, thanks @HertzDevil)
• (macros) Add HashLiteral#has_key? and NamedTupleLiteral#has_key? (#14890, thanks @kamil-gwozdz)
• (numeric) Implement floating-point manipulation functions for BigFloat (#11007, thanks @HertzDevil)
• (runtime) Stop & start the world (undocumented API) (#14729, thanks @ysbaddaden)
• (runtime) Add Pointer::Appender#to_slice (#14874, thanks @straight-shoota)
• (serialization) Add URI.from_json_object_key? and URI#to_json_object_key (#14834, thanks @nobodywasishere)
• (serialization) Add URI::Params::Serializable (#14684, thanks @Blacksmoke16)
• (system) Enable full backtrace for exception in process spawn (#14796, thanks @straight-shoota)
• (system) Implement System::User on Windows (#14933, thanks @HertzDevil)
• (system) Implement System::Group on Windows (#14945, thanks @HertzDevil)
• (system) Add methods to Crystal::EventLoop (#14977, thanks @ysbaddaden)
• (text) Add underscore_to_space option to String#titleize (#14822, thanks @Blacksmoke16)
• (text) Support Unicode 16.0.0 (#14997, thanks @HertzDevil)

compiler

• (cli) Adds initial support for external commands (#14953, thanks @bcardiff)
• (interpreter) Add Crystal::Repl::Value#runtime_type (#14156, thanks @bcardiff)
• (interpreter) Implement Reference.pre_initialize in the interpreter (#14968, thanks @HertzDevil)
• (interpreter) Enable the interpreter on Windows (#14964, thanks @HertzDevil)

Bugfixes

lang

• Fix Slice.literal for multiple calls with identical signature (#15009, thanks @HertzDevil)
• (macros) Add location info to some MacroIf nodes (#14885, thanks @Blacksmoke16)

stdlib

• (collection) Fix Range#size return type to Int32 (#14588, thanks @straight-shoota)
• (concurrency) Update DeallocationStack for Windows context switch (#15032, thanks @HertzDevil)
• (concurrency) Fix race condition in pthread_create handle initialization (#15043, thanks @HertzDevil)
• (files) [regression] Fix File#truncate and #lock for Win32 append-mode files (#14706, thanks @HertzDevil)
• (files) [breaking] Avoid flush in finalizers for Socket and IO::FileDescriptor (#14882, thanks @straight-shoota)
• (files) Make IO::Buffered#buffer_size= idempotent (#14855, thanks @jgaskins)
• (macros) Implement #sort_by inside macros using Enumerable#sort_by (#14895, thanks @HertzDevil)
• (macros) Fix internal error when calling #is_a? on External nodes (#14918, thanks @HertzDevil)
• (networking) Use correct timeout for Socket#connect on Windows (#14961, thanks @HertzDevil)
• (numeric) Fix handle empty string in String#to_f(whitespace: false) (#14902, thanks @Blacksmoke16)
• (numeric) Fix exponent wrapping in Math.frexp(BigFloat) for very large values (#14971, thanks @HertzDevil)
• (numeric) Fix exponent overflow in BigFloat#to_s for very large values (#14982, thanks @HertzDevil)
• (numeric) Add missing @[Link(dll:)] annotation to MPIR (#15003, thanks @HertzDevil)
• (runtime) Add missing return type of LibC.VirtualQuery (#15036, thanks @HertzDevil)
• (runtime) Fix main stack top detection on musl-libc (#15047, thanks @HertzDevil)
• (serialization) [breaking] Remove XML::Error.errors (#14936, thanks @straight-shoota)
• (specs) [regression] Fix Expectations::Be for module type (#14926, thanks @straight-shoota)
• (system) Fix return type restriction for ENV.fetch (#14919, thanks @straight-shoota)
• (system) #file_descriptor_close should set @closed (UNIX) (#14973, thanks @ysbaddaden)
• (system) reinit event loop first after fork (UNIX) (#14975, thanks @ysbaddaden)
• (text) Fix avoid linking libpcre when unused (#14891, thanks @kojix2)
• (text) Add type restriction to String#byte_index offset parameter (#14981, thanks @straight-shoota)

compiler

• (cli) Add error handling for linker flag sub commands (#14932, thanks @straight-shoota)
• (codegen) Allow returning Procs from top-level funs ([#14917], thanks @HertzDevil)
• (codegen) Fix CRT static-dynamic linking conflict in specs with C sources ([#14970], thanks @HertzDevil)
• (interpreter) Fix Linux getrandom failure in interpreted code ([#15035], thanks @HertzDevil)
• (interpreter) Fix undefined behavior in interpreter mixed union upcast ([#15042], thanks @HertzDevil)
• (semantic) Fix TopLevelVisitor adding existing ClassDef type to current scope ([#15067], thanks @straight-shoota)

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