## [1.13.0] (2024-07-09)
Features
lang

Allow rescuing exceptions that include a module (#14553, thanks @Blacksmoke16)
(macros) Allow assignment to _ inside macro expressions (#14452, thanks @HertzDevil)

stdlib

(collection) Add Array#insert_all (#14486, thanks @summer-alice)
(collection) Improve compile time error for #sort(&block : T, T -> U) (#14693, thanks @beta-ziliani)
(concurrency) Add WaitGroup synchronization primitive (#14167, thanks @ysbaddaden)
(concurrency) Allow Atomics of pointer types (#14401, thanks @HertzDevil)
(concurrency) Add Thread.new yields itself (#14543, thanks @ysbaddaden)
(concurrency) Add support for Atomic(Bool) (#14532, thanks @ysbaddaden)
(concurrency) Add Thread.sleep(Time::Span) (#14715, thanks @ysbaddaden)
(files) Implement IO#tty? in Win32 (#14421, thanks @HertzDevil)
(files) Implement File.readable? and .writable? in Win32 (#14420, thanks @HertzDevil)
(files) Make File.readable? and .writable? follow symlinks on Windows (#14514, thanks @HertzDevil)
(llvm) Add some missing LLVM::Context bindings (#14612, thanks @ysbaddaden)
(llvm) Do not strip the macOS target triple (#14466, thanks @hovsater)
(log) Support UInt32 and UInt64 in Log Context (#14459, thanks @toddsundsted)
(macros) Add AST node methods for macro-related nodes (#14492, thanks @HertzDevil)
(macros) Support short blocks in #[] operator call's macro interpolation (#14523, thanks @HertzDevil)
(macros) Add macro methods for Select (#14600, thanks @HertzDevil)
(macros) Add TypeNode#private?, #public? and #visibility (#11696, thanks @Hadeweka)
(macros) Add StringLiteral#to_utf16 (#14676, thanks @ysbaddaden)
(networking) Relax type restriction of handlers in HTTP::Server.new to Indexable(HTTP::Handler) (#14413, thanks @hugopl)
(networking) [security] OpenSSL: don't change default cipher suites (#14655, thanks @ysbaddaden)
(networking) Allow parsing cookies with space in the value (#14455, thanks @anton7c3)
(runtime) Add EventLoop::Socket module (#14643, thanks @straight-shoota)
(runtime) Add EventLoop::FileDescriptor module (#14639, thanks @straight-shoota)
(runtime) Add Crystal::Tracing for runtime tracing (#14659, thanks @ysbaddaden)
(system) [security] [breaking] Disable implicit execution of batch files on Windows (#14557, thanks @straight-shoota)
(system) Add EventLoop#run(blocking) and EventLoop#interrupt (#14568, thanks @ysbaddaden)
(system) Add Crystal::System::Time.ticks (#14620, thanks @ysbaddaden)
(system) Add Crystal::System::Thread.current_thread?, #scheduler? (#14660, thanks @ysbaddaden)
(system) Protect fork/exec on targets that don't support atomic CLOEXEC (#14674, thanks @ysbaddaden)
(system) Add Crystal::System.panic (#14733, thanks @ysbaddaden)
(text) Add Regex::MatchOptions overload for String#index! (#14462, thanks @HertzDevil)
(text) Add StringPool#get? (#14508, thanks @HertzDevil)
(text) Add pkg_config names for pcre2 and pcre (#14584, thanks @straight-shoota)
(text) Add UUID v7 (#14732, thanks @jgaskins)
(time) Add Time::Error (#14743, thanks @Blacksmoke16)

compiler

(codegen) Add compiler flags -Os and -Oz to optimize binary size (#14463, thanks @ysbaddaden)
(codegen) Add compiler support for AVR architecture (Arduino) (#14393, thanks @ysbaddaden)

tools

(formatter) Allow new formatter styles for trailing comma and whitespace around proc literal (#14726, thanks @Blacksmoke16)

Bugfixes
lang

(macros) Fix parsing of non-trailing if bodies inside macro expressions (#14505, thanks @HertzDevil)
(macros) Drop parentheses around -> inside certain comma-separated lists (#14506, thanks @HertzDevil)
(macros) Fix indentation of Select nodes' macro interpolation (#14510, thanks @HertzDevil)
(macros) Fix indentation of parenthesized Expressions#to_s (#14511, thanks @HertzDevil)

stdlib

(collection) [regression] Ensure Enumerable#to_a and Enumerable#tally properly retain return type of T (#14447, thanks @Blacksmoke16)
(collection) [breaking] Never raise IndexError in #[]?(Range) (#14444, thanks @HertzDevil)
(collection) [breaking] Fix Set#to_a(&) (#14519, thanks @meatball133)
(collection) Fix Hash#rehash to reset @first (#14606, thanks @straight-shoota)
(collection) Fix macro interpolation in NamedTuple#from (#14790, thanks @HertzDevil)
(collection) [regression] Fix regression with NamedTuple.new when using key with a hyphen (#14785, thanks @Blacksmoke16)
(files) Allow #fsync and #flock_* on IO::FileDescriptor (#14432, thanks @HertzDevil)
(files) Make IO::FileDescriptor#tty? return false for NUL on Windows (#14509, thanks @HertzDevil)
(files) Fix blockless IO::FileDescriptor echo and raw mode methods (#14529, thanks @HertzDevil)
(files) Remove target path's forward slashes in File.symlink on Windows (#14522, thanks @HertzDevil)
(files) Fix IO#same_content? accepting prefix on second stream (#14664, thanks @straight-shoota)
(files) Fix overflow in File#read_at for large offsets on Windows (#14708, thanks @HertzDevil)
(files) Fix IO::FileDescriptor.new for closed fd (#14697, thanks @straight-shoota)
(files) Fix IO::Delimited reading into limited slice with peek (#14772, thanks @straight-shoota)
(files) Fix Compress::Gzip extra field (#14550, thanks @kojix2)
(log) delete source from builder cache when finalize (#14475, thanks @ysbaddaden)
(networking) Fix Socket#close error handling on Windows (#14517, thanks @HertzDevil)
(networking) Set UTF-8 charset on directory listing in HTTP::StaticFileHandler (#14546, thanks @alexkutsan)
(networking) Don't pass socket file descriptors to subprocesses on Unix (SOCK_CLOEXEC) (#14632, thanks @carlhoerberg)
(networking) [security] OpenSSL: don't set default ECDH curve (#14656, thanks @ysbaddaden)
(networking) [security] OpenSSL: deprecate Mozilla's TLS Server recommendation (#14657, thanks @ysbaddaden)
(networking) use SOCK_CLOEXEC with FD_CLOEXEC fallback (#14672, thanks @ysbaddaden)
(networking) [regression] Fix regression on Socket#connect timeout type restriction (#14755, thanks @straight-shoota)
(networking) Drop default timeout for Socket#connect on Windows (#14756, thanks @straight-shoota)
(networking) don't hardcode alpn protocol byte size (OpenSSL) (#14769, thanks @ysbaddaden)
(numeric) Fix BigRational#format (#14525, thanks @meatball133)
(numeric) [regression] Restore leading zero in exponent for printf("%e") and printf("%g") (#14695, thanks @straight-shoota)
(runtime) Fix enable docs for builtin constants (#14571, thanks @straight-shoota)
(runtime) Fix GC.malloc for gc_none to clear memory (#14746, thanks @straight-shoota)
(serialization) Fix JSON discriminator for Bool false value (#14779, thanks @dammer)
(specs) Fix relative file paths in spec output (#14725, thanks @straight-shoota)
(system) Fix using System.retry_with_buffer with stack buffer (#14615, thanks @straight-shoota)
(system) Harmonize close on exec for Socket & FileDescriptor on Windows (#14634, thanks @ysbaddaden)
(system) Use dup3 and pipe2 to set O_CLOEXEC when available (#14673, thanks @ysbaddaden)
(system) Fix calls to retry_with_buffer when big buffer is necessary (#14622, thanks @BlobCodes)
(system) Fix Process.run with closed IO (#14698, thanks @straight-shoota)
(system) Prefer strerror_r over strerror for thread-safe errno (#14764, thanks @ysbaddaden)
(text) Make String#sub raise IndexError if index is equal to size (#14458, thanks @HertzDevil)
(text) Fix libpcre2 version detection not working for -RC{N} versions (#14478, thanks @Frityet)
(text) Fix Regex#inspect with non-literal-compatible options (#14575, thanks @straight-shoota)
(text) Fix ECR escape sequences containing - (#14739, thanks @HertzDevil)

compiler

(codegen) Fix create new target_machine for every program (#14694, thanks @straight-shoota)
(codegen) Make ReferenceStorage(T) non-atomic if T is non-atomic (#14730, thanks @HertzDevil)
(codegen) Detect and error on failed codegen process (#14762, thanks @ysbaddaden)
(codegen) Fix stats and progress issues in codegen (#14763, thanks @ysbaddaden)
(debugger) Fix LLDB crystal_formatters.py for Python 3 (#14665, thanks @zw963)
(parser) Disallow assignments to calls with parentheses (#14527, thanks @HertzDevil)
(parser) Fix parser validate UTF-8 on first input byte  (#14750, thanks @straight-shoota)
(semantic) Fix type def reopening type from parent namespace (#11208, thanks @straight-shoota)
(semantic) Fix Crystal::Path#to_macro_id for global path (#14490, thanks @straight-shoota)
(semantic) Fix Class#=== on metaclass (#11162, thanks @makenowjust)

tools

(docs-generator) Fix generate docs for builtins HOST_TRIPLE and TARGET_TRIPLE (#14570, thanks @straight-shoota)
(docs-generator) Decode URI component for search functionality in docs (#14645, thanks @nobodywasishere)
(formatter) Fix formatting for short block inside #[] operator call (#14526, thanks @HertzDevil)
(formatter) Fix formatter to skip trailing comma for single-line parameters (#14713, thanks @Blacksmoke16)

Chores
stdlib

(collection) Drop obsolete workaround in Range#reverse_each (#14709, thanks @yxhuvud)
(concurrency) Add WaitGroup to docs_main.cr (#14624, thanks @straight-shoota)
(files) [deprecation] Move File.readable?, .writable?, .executable? to File::Info (#14484, thanks @straight-shoota)
(networking) Drop Crystal::System::Socket#system_send (#14637, thanks @straight-shoota)
(networking) Add type restriction host : String in TCPSocket and Addrinfo (#14703, thanks @straight-shoota)
(runtime) Fix abstract def parameter name in LibEvent::EventLoop#send_to (#14658, thanks @straight-shoota)
(runtime) [breaking] Drop unused methods in IO::Evented (#14666, thanks @straight-shoota)
(runtime) Drop IO::Overlapped (#14704, thanks @straight-shoota)

compiler

(codegen) [breaking] Remove CRYSTAL_LIBRARY_RPATH and delay-load helper (#14598, thanks @HertzDevil)

Performance
stdlib

(collection) Optimize Hash for repeated removals and insertions (#14539, thanks @HertzDevil)
(runtime) Remove unnecessary explicit memory barriers on ARM (#14567, thanks @ysbaddaden)
(serialization) Optimize JSON parsing a bit (#14366, thanks @asterite)
(text) Use wrapping arithmetic for Int::Primitive#unsafe_chr (#14443, thanks @HertzDevil)
(text) Optimize String#index(Char) and #rindex(Char) for invalid UTF-8 (#14461, thanks @HertzDevil)
(text) Optimize String#to_utf16 (#14671, thanks @straight-shoota)

Refactor
stdlib

Remove unnecessary calls to #unsafe_as(UInt64) etc. (#14686, thanks @straight-shoota)
(crypto) Replace calls to StaticArray(UInt8, 1)#unsafe_as(UInt8) (#14685, thanks @straight-shoota)
(files) Remove calls to LibC._setmode (#14419, thanks @HertzDevil)
(files) Use file handles directly instead of C file descriptors on Win32 (#14501, thanks @HertzDevil)
(files) Refactor win32 System::FileDescriptor#unbuffered_{read,write} (#14607, thanks @straight-shoota)
(files) Extract #system_read and #system_write for FileDescriptor and Socket (#14626, thanks @straight-shoota)
(files) Drop unused slice parameters of #evented_* methods (#14627, thanks @straight-shoota)
(networking) Refactor use IO#read_byte instead of #read_char in HTTP::ChunkedContent (#14548, thanks @straight-shoota)
(runtime) Thread owns its current fiber (instead of Crystal::Scheduler) (#14554, thanks @ysbaddaden)
(runtime) Use Fiber#enqueue (#14561, thanks @ysbaddaden)
(runtime) Add Crystal::EventLoop.current (#14559, thanks @ysbaddaden)
(runtime) Add Fiber.suspend (#14560, thanks @ysbaddaden)
(runtime) Remove OverlappedOperation#synchronous (#14663, thanks @straight-shoota)
(runtime) Rename Crystal::Iocp to Crystal::IOCP (#14662, thanks @straight-shoota)
(runtime) Unify EventLoop.create (#14661, thanks @straight-shoota)
(serialization) Replace type declarations for void pointers with alias in libxml2 (#14494, thanks @straight-shoota)
(serialization) Refactor JSON::Any#size to use two branches instead of three (#14533, thanks @meatball133)
(specs) Move Spec context state into Spec::CLI (#14259, thanks @HertzDevil)
(system) Update WinError#to_errno (#14515, thanks @HertzDevil)
(system) Rename Crystal::System.print_error(fmt, *args, &) to printf (#14617, thanks @ysbaddaden)
(system) Refactor Crystal::System.retry_with_buffer calling #to_slice (#14614, thanks @straight-shoota)
(system) Extract system implementation of UNIXSocket.pair as Crystal::System::Socket.socketpair (#14675, thanks @ysbaddaden)
(system) Remove calls to Pointer.new(Int) (#14683, thanks @straight-shoota)
(system) Cleanup for IOCP::OverlappedOperation (#14723, thanks @straight-shoota)
(system) Refactor IOCP::OverlappedOperation internalize handle and wait_for_completion (#14724, thanks @straight-shoota)

compiler

(codegen) Add Program#size_t and Target#size_bit_width (#14442, thanks @ysbaddaden)
(parser) Replace Crystal::Select::When with Crystal::When (#14497, thanks @HertzDevil)

Documentation
stdlib

(collection) Fix doc for Set#proper_superset_of? (#14516, thanks @meatball133)
(collection) Fix result formatting in code example for Indexable#[]? (#14721, thanks @meatball133)
(concurrency) Fix example for WeakRef by removing ref.value call (#10846, thanks @hugopl)
(networking) Improve API docs for Socket#send (#14638, thanks @straight-shoota)
(networking) Add documentation for HTTP::WebSocket#stream (#14537, thanks @meatball133)
(numeric) Add documentation for complex methods inside Number (#14538, thanks @meatball133)
(runtime) Add documentation for standard streams blocking behaviour (#14577, thanks @straight-shoota)
(serialization) Fix docs for CSV::Builder#row(&) (#14736, thanks @philipp-classen)
(system) [breaking] Undocument IO::Evented (#14749, thanks @straight-shoota)
(system) Fix code example for Process.on_terminate (#14798, thanks @philipp-classen)
(text) Fix docs for Char#ascii_number? stating wrong minium base (#14521, thanks @meatball133)
(text) Enhance documentation for regex options NO_UTF_CHECK (#14542, thanks @straight-shoota)

Specs
stdlib

Remove incorrect uses of describe (#14757, thanks @HertzDevil)
(files) Add spec for Compress::Gzip::Writer with extra (#14788, thanks @straight-shoota)
(runtime) Add specs for Pointer::Appender (#14719, thanks @straight-shoota)
(text) Add test helper for normalize/regex_spec (#14545, thanks @straight-shoota)

Infrastructure

Changelog for 1.13.0 (#14712, thanks @straight-shoota)
Update previous Crystal release 1.12.1 (#14480, thanks @straight-shoota)
Highlight regression bugfixes in changelog (#14474, thanks @straight-shoota)
Write release version to src/VERSION in update-changelog and release-update (#14547, thanks @straight-shoota)
Fix shell.nix use llvmPackages.bintools with wrapper for rpath config (#14583, thanks @straight-shoota)
Add src/SOURCE_DATE_EPOCH to release tree (#14574, thanks @straight-shoota)
Update distribution-scripts (#14562, thanks @straight-shoota)
Update distribution-scripts (#14863, thanks @straight-shoota)
Use boehmgc package from nixpkgs in shell.nix (#14591, thanks @straight-shoota)
Simplify LLVM dependency in shell.nix (#14590, thanks @straight-shoota)
Fix nixpkgs pkg-config name in shell.nix (#14593, thanks @straight-shoota)
Update previous Crystal release 1.12.2 (#14647, thanks @straight-shoota)
Update distribution-scripts (#14648, thanks @straight-shoota)
Update distribution-scripts (#14714, thanks @straight-shoota)
Update distribution-scripts (#14776, thanks @straight-shoota)
Fix changelog generator increase topic priority for infrastructure (#14781, thanks @straight-shoota)
Remove SetShouldExit in Powershell wrapper (#13769, thanks @straight-shoota)
(ci) Run primitives_spec with the interpreter on CI (#14438, thanks @HertzDevil)
(ci) Add LLVM 18 to LLVM CI (#14565, thanks @HertzDevil)
(ci) Update to Ruby 3 in macOS circleCI runner (#14777, thanks @straight-shoota)
(ci) Distribute shards.pdb on Windows (#14415, thanks @HertzDevil)
(ci) Drop Windows CI workaround for 1.12.0-dev (#14483, thanks @HertzDevil)