1.4.1

Standard Library

Collection

• Avoid compile-time error on empty NamedTuples. (#12007, thanks @I3oris)

Files

• Add missing fun def for __xstat (#11985, thanks @straight-shoota)

Runtime

• Add pthread link annotations in lib bindings (#12013, thanks @straight-shoota)
• Fix GC typedefs on Windows (#11963, thanks @HertzDevil)

Compiler

Semantic

• Compiler: remove duplicate instance vars once we know them all (#11995, thanks @asterite)

1.4.0

Language

• Add support for Int128 in codegen and macros (#11576, thanks @BlobCodes)
• Support ProcPointers with global path and top-level method references (#11777, thanks @HertzDevil)
• Fix documentation for macros system and run (#11740, thanks @lbguilherme)
• Experimental: better type inference for ivars/cvars (#11812, thanks @asterite)
• Support @[Deprecated] on constants (#11680, thanks @HertzDevil)

Standard Library

• Fix compiler flags with optional arg eating following flags (#11201, thanks @yb66)
• Support GNU style optional arguments in OptionParser (#11546, thanks @HertzDevil)
• Remove some unnecessary link annotations (#11563, thanks @straight-shoota)
• Remove useless assignments (#11774, thanks @IgorPolyakov)
• Use "truthy" and "falsey" in more places in the documentation (#11784, thanks @HertzDevil)
• Add missing code blocks for self in documentation (#11718, thanks @HertzDevil)
• Add support for LLVM 14.0 (#11905, thanks @HertzDevil)
• Fix code examples in doc comments (2022-03) (#11927, thanks @maiha)

Collection

• Remove Iterator.of(Iterator.stop) from implementations (#11613, thanks @asterite)
• Add allow Enumerable arguments for Hash#select and #reject (#11750, thanks @mamantoha)
• Add docs for Hash#reject! (#11691, thanks @wontruefree)
• Add raising method variants Enumerable#find! and #index! (#11566, thanks @yxhuvud)
• (performance) Optimize block-less overloads of BitArray#fill (#11450, thanks @HertzDevil)
• Adds docs for Array#replace (#11682, thanks @wontruefree)
• (performance) Optimize BitArray's counting methods (#11591, thanks @HertzDevil)
• Add some return types to Array, Hash, Set and String (#11822, thanks @asterite)
• Add Hash#update (#11881, thanks @ftarulla)
• Allow Bytes[] to construct an empty Bytes (#11897, thanks @HertzDevil)
• Improve BitArray's constructors (#11898, thanks @HertzDevil)
• Add overload to Enumerable#tally and #tally_by accepting a hash (#11815, thanks @mamantoha)

Crypto

• Add support for Bcrypt algorithm version 2b (#11595, thanks @docelic)

Files

• Fix race condition in chown (#11885, thanks @didactic-drunk)
• Add docs for Dir#each_child (#11688, thanks @wontruefree)
• Add docs for Dir#path (#11689, thanks @wontruefree)
• Support read-write + binary file modes in File.open (#11817, thanks @HertzDevil)
• Add docs for Dir#entries (#11701, thanks @wontruefree)
• Add IO#getb_to_end (#11830, thanks @HertzDevil)
• Fix IO::FileDescriptor#pos giving incorrect position after write (#10865, thanks @didactic-drunk)
• Remove reference to binary file mode in File.open (#11824, thanks @HertzDevil)

Macros

• Add #parse_type (#11126, thanks @Blacksmoke16)

Networking

• (performance) Optimize URI.decode (#11741, thanks @asterite)
• Fix address_spec expectation for Windows Server 2022 (#11794, thanks @straight-shoota)
• Add space_to_plus option in URI::Params everywhere (#11821, thanks @asterite)
• Improve URI::Params#inspect to use hash-like literal (#11880, thanks @straight-shoota)
• Use enums instead of symbols for MIME::Multipart and HTTP::FormData (#11617, thanks @HertzDevil)

Numeric

• (breaking-change) Fix: Hide BigDecimal::ZERO and BigDecimal::TEN (#11820, thanks @lbguilherme)
• (breaking-change) Add support for scientific notation in BigFloat#to_s (#10632, thanks @HertzDevil)
• Fix: Inspect string in error message for number parsing (#11883, thanks @straight-shoota)
• Add docs for Complex#zero? (#11697, thanks @wontruefree)
• Fix E notation parsing in BigDecimal (#9577, thanks @stevegeek)
• (performance) Optimize Integer decoding from bytes (#11796, thanks @carlhoerberg)

Runtime

• Fix interpreter when shared library pthread is missing (#11807, thanks @straight-shoota)
• (performance) Implement Intrinsics.pause for aarch64 (#11742, thanks @lbguilherme, @jgaskins)
• Add crash handler on Windows (#11570, thanks @HertzDevil)
• Add specs for NamedTuple#from (#11816, thanks @straight-shoota)
• Improve error for incompatible generic arguments for WeakRef (#11911, thanks @straight-shoota)
• Add the wasm entrypoint defined in Crystal (#11936, thanks @lbguilherme)

Serialization

• Allow passing instance method or conditional expressions to option ignore_serialize on JSON::Field (#11804, thanks @cyangle)
• Implement Iterator.from_json and #to_json (#10437, thanks @wonderix)

Specs

• Add file and line arguments to it_iterates (#11628, thanks @straight-shoota)
• Remove duplicate word in documentation (#11797, thanks @samueleaton)

System

• (breaking-change) (security) Fix character mappings for Windows path conversions (#11847, thanks @straight-shoota)
• Add fallback for Path.home on Unix (#11544, thanks @HertzDevil)
• Relax ENV.fetch(key, &)'s block restriction (#11779, thanks @HertzDevil)
• Refactor target clauses for system implementations (#11813, thanks @straight-shoota)
• Fix Path support for UNC shares (#11827, thanks @straight-shoota)
• Fix regression for Linux older than 3.17: properly check that getrandom is available (#11953, thanks @lbguilherme)

Text

• Fix ensure PCRE JIT mode is available before running spec (#11533, thanks @Blacksmoke16)
• Add more Colorize overloads and fix docs (#11832, thanks @asterite)
• Refactor Colorize::Mode enum (#11663, thanks @straight-shoota)
• Add some docs for UUID (#11683, thanks @wontruefree)
• Add docs for UUID#urn (#11693, thanks @wontruefree)
• Add docs for String#[] (#11690, thanks @wontruefree)
• Allow explicit usage of libiconv (#11876, thanks @luislavena)
• (breaking-change) Fix: Honour encoding in IO::Memory#to_s (#11875, thanks @straight-shoota)
• Add self return type to UUID constructor methods (#10539, thanks @straight-shoota)
• Fix infinite loop for certain StringPool initial capacities (#11929, thanks @HertzDevil)

Time

• Add examples to `Time::F...

1.3.2

Standard Library

Text

• Fix buffer overflow in String#index (#11747, thanks @asterite, @straight-shoota)

1.3.1

Standard Library

• Remove useless variable declarations in trailing position (#11704, thanks @HertzDevil)

Crypto

• Fix for missing BIO_* functions in OpenSSL < 1.1.0 (#11736, thanks @daliborfilus)

Runtime

• Remove string allocation from GC_set_warn_proc (#11729, thanks @straight-shoota)

Tools

• Doc generator: Fix escape HTML in code span (#11686, thanks @straight-shoota)
• Fix formatter error for ProcLiterals with Union return type (#11709, thanks @HertzDevil)

Other

• Fix typos (#11725, thanks @kianmeng)

Release 1.3.0

1.3.0 (2022-01-06)

Compiler

• Refer to T.class as "metaclass" in error messages, not "class" (#11378, thanks @HertzDevil)
• Create Reason enum for exhaustive case in nil-reason check (#11449, thanks @rymiel)
• Improve cache directory behaviour on Windows (#11436, thanks @HertzDevil)
• Automatically detect MSVC tools on Windows via vswhere (#11496, thanks @HertzDevil)
• Clean up .pdb files for temporary executables on MSVC (#11553, thanks @HertzDevil)
• Disable incremental linking on MSVC (#11552, thanks @HertzDevil)
• Allow multiple --emit compiler options to stack (#11556, thanks @HertzDevil)
• Refactor some type restrictions in the compiler (#11531, thanks @straight-shoota)
• Detect cl.exe's path for compiler specs requiring a C compiler (#11560, thanks @HertzDevil)
• Increase default stack size on MSVC to 8 MB (#11569, thanks @HertzDevil)
• Resolve compiler wildcard require (#11562, thanks @straight-shoota)
• Compiler: use enums instead of symbols in various places (#11607, thanks @HertzDevil)

Codegen

• Disable specs for StaticArray#sort_by on broken targets (#11359, thanks @straight-shoota)
• Fix link flag behaviour on Windows MSVC (#11424, thanks @HertzDevil)
• Attach debug locations to splat expansions inside array-like literals (#11655, thanks @HertzDevil)
• Use full name for private types' class variables during codegen (#11651, thanks @HertzDevil)
• Fix codegen when instantiating class methods of typedefs (#11636, thanks @HertzDevil)
• Add minimal load-time DLL support on Windows, support dllimport storage class (#11573, thanks @HertzDevil)

Debugger

• Attach debug locations to auto-generated initialize methods (#11313, thanks @HertzDevil)
• Fix debug location for ~check_proc_is_not_closure (#11311, thanks @HertzDevil)

Interpreter

• crystal i, a Crystal interpreter (#11159, thanks @asterite)
• Implement FFI bindings (#11475, thanks @straight-shoota)
• Add Crystal::Loader (#11434, #11662, thanks @straight-shoota, @HertzDevil)
• Mark bswap32 instrinsic with interpreter primitive annotation (#11582, thanks @rymiel)
• Split interpreter specs into separate files (#11578, thanks @straight-shoota)
• Workaround for GC issues in interpreter specs (#11634, thanks @straight-shoota)

Parser

• Parser: allow keyword as named argument inside macros (#10377, thanks @asterite)
• Parser: add missing end location to IsA node (#11351, thanks @FnControlOption)
• Fix node locations for ProcLiterals with parameters (#11365, thanks @HertzDevil)
• Fix parser error with named argument end in macro body (#11463, thanks @straight-shoota)
• Report syntax error for too-long bin/hex/oct integer literals (#11447, thanks @oprypin)
• [lexer] Correctly increase nesting for escaped macro unless (#11440, thanks @rymiel)
• Show proper syntax errors in some edge cases in the parser (#11446, thanks @oprypin)
• Fix parse yield with parenthesis (#11469, thanks @straight-shoota)
• Lexer number parsing refactor (#11211, thanks @BlobCodes)
• Allow underscores after a leading zero in String#to_i (regression fix) (#11672, thanks @BlobCodes)
• Fix no comma before short block in ToSVisitor (#11677, thanks @homonoidian)
• Unify format of "unexpected token" error (#11473, thanks @straight-shoota)
• Implement lexer int128 support (#11571, thanks @BlobCodes)

Semantic

• Show proper owner for Class's methods in error messages (#10590, thanks @HertzDevil)
• Be more strict about ProcNotation variable declarations (#11372, thanks @HertzDevil)
• Allow metaclass parameters in Proc literals and pointers (#11367, thanks @HertzDevil)
• Fix top-level multi-assign splat variable not working in macros (#11600, thanks @HertzDevil)
• Replace semantic with assert_no_errors in compiler specs whenever possible (#11288, thanks @HertzDevil)
• Make inject_primitives = false default for semantic specs (#11297, thanks @HertzDevil)
• Add spec for #8428 (#10073, thanks @docelic)
• Remove and resolve spurious cast and its associated FIXME (#11455, thanks @rymiel)
• Add pending spec for recursive abstract struct (#11470, thanks @HertzDevil)

Language

• (breaking-change) Require elements in 1-to-n assignments to match targets exactly (#11145, thanks @HertzDevil)
• (breaking-change) Require right-hand side of one-to-many assignments to be Indexable (#11545, thanks @HertzDevil)
• Support splats on left-hand sides of multiple assignment expressions (#10410, thanks @HertzDevil)
• Make all AST nodes immutable through container-returning methods (#11397, thanks @HertzDevil)
• Add auto upcast for integer and float values (#11431, #11529, thanks @asterite, @beta-ziliani)

Standard Library

• Fix Process::INITIAL_PWD for non-existent path (#10525, thanks @straight-shoota)
• Resolve some TODOs (#11369, thanks @straight-shoota)
• Refactor some target flag uses (#11466, thanks @straight-shoota)
• Use Slice(UInt8)#fill in the standard library (#11468, thanks @HertzDevil)
• Update spec/win32_std_spec.cr (#11432, #11637, thanks @HertzDevil)
• Use strings instead of symbols in #finalize specs (#11619, thanks @HertzDevil)
• Fix Enum.parse to handle case-sensitive member names (#11659, thanks @straight-shoota)
• Improve docs for Object#not_nil! (#11661, thanks @straight-shoota)

Collection

• (breaking-change) Always use start as parameter in subrange-accepting methods (#11350, thanks @HertzDevil)
• (breaking-change) Refactor Indexable::Mutable#fill's overloads (#11368, thanks @HertzDevil)
• Add sorting methods to StaticArray (#10889, thanks @HertzDevil)
• Add spaceship operator to StaticArray (#11364, thanks @henrikac)
• (performance) Optimize BitArray#reverse! (#11363, thanks @HertzDevil)
• (performance) Grow large arrays more slowly (#11482, thanks @mgomes)
• Fix docs for Indexable::Mutable#map! (#11349, thanks @HertzDevil)
• Add Slice#unsafe_slice_of, #to_unsafe_bytes (#11379, thanks @HertzDevil)
• (performance) Avoid reallocation ...

1.2.2

Compiler

• x86_64 ABI: pass structs indirectly if there are no more available registers (#11344, thanks @ggiraldez)
• Add parentheses around type name for metaclasses of unions (#11315, thanks @HertzDevil)
• (regression) Restrict virtual metaclasses to themselves against Class (#11377, thanks @HertzDevil)
• (regression) Add fallback for union debug type if current debug file is not set (#11390, thanks @maxfierke)
• (regression) Add missing debug locations to constant / class variable read calls (#11417, thanks @HertzDevil)

Standard Library

Collection

• Fix BitArray#toggle when toggling empty subrange (#11381, thanks @HertzDevil)

Crypto

• Update for OpenSSL 3.0.0 (#11360, thanks @straight-shoota)
• Restore libressl support and add CI for that (#11400, thanks @straight-shoota)
• Replace lib version comparisons by functional feature checks (#11374, thanks @straight-shoota)

Runtime

• Add support for DWARF 5 (#11399, thanks @straight-shoota)
• Retrieve filename of shared libs, use in stacktraces (#11408, thanks @rdp)

Other

• [CI] Fix enable nix-command as experimental feature (#11398, thanks @straight-shoota)
• [CI] Fix OpenSSL 3 apk package name (#11418, thanks @straight-shoota)
• Update distribution-scripts (#11404, thanks @straight-shoota)
• [CI] Fix pcre download URL (#11422, thanks @straight-shoota)

1.2.1

Compiler

• Adding location to the Path returned by the literal expander for regex (#11334, thanks @beta-ziliani)

Standard Library

• Add support for LLVM 13 (#11302, thanks @maxfierke)

Runtime

• Move the :nodoc: flags to the right place to hide the __mul* functions. (#11326, thanks @wyhaines)

Tools

• Update markd subtree to v0.4.2 (#11338, thanks @straight-shoota)

1.2.0

Compiler

• Fix variance checks between generic instances for Proc#call and abstract defs. (#10899, thanks @HertzDevil)
• Fix proc_spec forcing normal compilation instead of JIT (#10964, thanks @straight-shoota)
• Fix ProcNotation#to_s remove whitespace for nil output type (#10935, thanks @straight-shoota)
• Compiler: carry FileModule information inside Block (#11039, thanks @asterite)
• Splat values correctly inside return/break/next statements (#10193, thanks @HertzDevil)
• Handle already stripped column numbers in compiler exceptions (#11008, thanks @pyrsmk)
• Substitute unbound type parameters in virtual metaclass types (#11067, thanks @HertzDevil)
• Improve detection of instance variables in extended modules (#10554, thanks @HertzDevil)
• Don't compute instance variable initializers on unbound generic instances (#11000, thanks @HertzDevil)
• Syntax errors for invalid 128-bit integer literals (#10975, thanks @rymiel)
• Support auto-splatting in captured block literals (#10251, thanks @HertzDevil)
• Detect cyclic includes between generic modules (#10529, thanks @HertzDevil)
• Add stricter checks for arguments to macro methods on AST nodes (#10498, thanks @HertzDevil)
• Compiler: fix is_a? for virtual metaclass types (#11121, thanks @asterite)
• Fix edge cases with unicode method names (#10978, thanks @HertzDevil)
• Don't emit debug info for unused variable declarations (#10957, thanks @HertzDevil)
• Fix Call.def_full_name print full block parameter (#10915, thanks @straight-shoota)
• Allow union types to be unbound (#11166, thanks @HertzDevil)
• Make typeof start a nested lexical scope (#10796, thanks @HertzDevil)
• Fix edge case for intersection between virtual metaclasses (#11185, thanks @HertzDevil)
• Compiler: don't trigger "already had enclosing call" for same object (#11202, thanks @asterite)
• Properly handle indirect arguments for external C functions (#11189, thanks @ggiraldez)
• Fix resolve generic argument in block output type restriction mismatch (#11186, thanks @straight-shoota)
• Secure array slicing when expanding macro for stack trace (#11109, thanks @pyrsmk)
• Fix debug locations for Proc pointers (#11243, thanks @HertzDevil)
• Allow assignments from generic instance metaclasses to virtual metaclasses (#11250, thanks @HertzDevil)
• Refactor CrystalPath#find_in_path_relative_to_dir for readability (#10876, #10990, #10988, thanks @straight-shoota)
• Allow constants and instance / class variables as receivers for setter proc pointers (#10741, thanks @HertzDevil)
• Do not use globals for regex (#10951, thanks @asterite)
• Define type filtering through an intersection operation (#10781, thanks @HertzDevil)
• Fix no overflow check when primitive int converts to same type (#11003, thanks @HertzDevil)
• Attach debug locations to generated internal LLVM functions (#10934, thanks @HertzDevil)
• Add helpful error message for invalid number literal like '.42' (#4665, thanks @makenowjust)
• Add CrystalPath.expand_paths, expand relative to compiler path (#11030, thanks @straight-shoota)
• Clarify usage of "arguments" and "parameters" in error messages (#10378, thanks @HertzDevil)
• (performance) Don't generate type IDs for formal generic instances (#11167, thanks @HertzDevil)
• (performance) Don't generate unique type IDs for virtual metaclasses (#11188, thanks @HertzDevil)
• Add an environment variable for dumping type IDs (#11168, thanks @HertzDevil)
• Allow underscores in macro for's loop variables (#11141, thanks @HertzDevil)
• (performance) Compiler: cache cleanup transformer (#11197, thanks @asterite)
• Avoid needless union in LLVM::ABI::AArch64#homogeneous_aggregate? (#11199, thanks @asterite)
• Removing ThinLTO support (#11194, thanks @beta-ziliani)
• Error if abstract def implementation is inherited from supertype (#11056, thanks @straight-shoota)
• (performance) Add inject_primitives: false to macro_spec (#11269, thanks @straight-shoota)
• Primitive annotations for interpreter (#11147, thanks @asterite)
• Support generic module instances in TypeNode#includers (#11116, thanks @HertzDevil)
• Reject hash literals with mixed syntax (#11154, thanks @makenowjust)

Language

• Make .as?(NoReturn) always return nil (#10896, thanks @HertzDevil)
• Compiler: make is_a?(union) work correctly for virtual types (#11176, thanks @asterite)
• Adjust docs for Crystal::Macros::HashLiteral#[] (#10930, thanks @kevinsjoberg)
• Fix path lookup when ancestor finds type with same name as current scope (#10901, thanks @HertzDevil)
• Fix several compile-time operations on generic instance metaclasses (#11101, thanks @HertzDevil)
• Make #is_a? in macros respect the AST node hierarchy (#11062, thanks @HertzDevil)
• Add docs to string methods in SymbolLiteral and MacroId (#9298, thanks @makenowjust)
• Add clarification about when instance_vars can be called (#11171, thanks @willhbr)
• Add file_exists? macro method (#10540, thanks @Sija)

Standard Library

• (breaking-change) Change nonsense return types to Nil: uncategorized (#10625, thanks @oprypin)
• (breaking-change) Change nonsense return types to Nil in formatter classes (#10623, thanks @oprypin)
• Add base64 to prelude (#11050, thanks @straight-shoota)
• Remove calls to deprecated SystemError.from_winerror (#11220, thanks @straight-shoota)
• Add support for LLVM 12 (#10873, #11178, thanks @maxfierke, @Blacksmoke16)
• Examples: fix (2021-09) (#11234, thanks @maiha)
• Don't use :nodoc: when overriding public methods (#11096, thanks @HertzDevil)
• Add internal registry implementation for win32 (#11137, thanks @straight-shoota)

Collection

• (breaking-change) Move Array#product to Indexable#cartesian_product (#10013, thanks @HertzDevil)
• Disallow Slice(T).new(Int) where T is a union of primitive number types (#10982, thanks @HertzDevil)
• Make Array#transpose, Enumerable#reject, Enumerable#to_h work with tuples (#10445, thanks @HertzDevil)
• Fix Enumerable#each block return type (#10928, thanks @straight-shoota)
• Fix key type f...

1.1.1

Language changes

• Revert name of top-level module to main (#10993, thanks @beta-ziliani)

Standard Library

• Fix missing required args for Socket::Addrinfo::Error.new (#10960, thanks @straight-shoota)
• Fix disable unnecessary spec on win32 (#10971, thanks @straight-shoota)
• Remove incorrect type restrictions on index methods with offset (#10972, thanks @straight-shoota)
• Fix: documentation of #step in Number and Char (#10966, #11006, thanks @beta-ziliani and @straight-shoota)

Compiler

• Fix parsing macro body with escaped backslash in literal (#10995, thanks @straight-shoota)

Other

• Updating aarch64 actions to use 1.0.0 images (#10976, thanks @beta-ziliani)

1.1.0

1.1.0 (2021-07-14)

Language changes

• Support splat expansions inside tuple and array literals. (#10429, thanks @HertzDevil)
• Support breaks with values inside while expressions. (#10566, thanks @HertzDevil)

Macros

• Add @top_level to access the top-level scope in macros. (#10682, thanks @beta-ziliani)
• Fix: preserve integer sizes in NumberLiteral#int_bin_op. (#10713, thanks @collidedscope)
• Add NumberLiteral#to_number. (#10802, thanks @straight-shoota)
• (breaking-change) Add Crystal::Macros::Path#global? deprecating the old Crystal::Macros::Path#global. (#10812, thanks @HertzDevil)
• Minor fixes to docs of UnaryExpression macro nodes. (#10816, thanks @HertzDevil)
• Add macro method ASTNode#nil?. (#10850, #10616, thanks @straight-shoota)

Standard library

Global changes

Windows support

• Port Socket::Address to win32 . (#10610, thanks @straight-shoota)
• Port Socket::Addrinfo to win32. (#10650, thanks @straight-shoota)
• Extract system-specifics from Socket. (#10706, thanks @straight-shoota)
• Make WinError portable and add it to prelude. (#10725, thanks @straight-shoota)
• Improve portability of SystemError. (#10726, thanks @straight-shoota)
• Refactor Socket::Addrinfo::Error based on os_error . (#10761, thanks @straight-shoota)
• Add WinError.wsa_value and specs for WinError. (#10762, thanks @straight-shoota)
• Add specs for Errno. (#10763, thanks @straight-shoota)
• Refactor: Move win32 libc bindings from winbase.cr to approriate files. (#10771, thanks @straight-shoota)
• Refactor: Change protocol socket fd to Socket::Handle. (#10772, thanks @straight-shoota)
• Fix Socket::Connect error in addrinfo inherit os_error. (#10782, thanks @straight-shoota)
• Reorganize some win32 libc bindings (#10776, thanks @straight-shoota)

Type annotations

• Add type restriction to private Process constructor. (#7040, thanks @z64)
• Add various return type restrictions (thanks @oprypin, @straight-shoota, and @caspiano):
  #10578, #10579,
  #10580, #10581,
  #10582, #10583,
  #10584, #10585,
  #10586, #10587,
  #10588, #10849,
  #10856, #10857,
  #10858, #10905
• Add type restrictions for splat-less overloads of some methods. (#10594, thanks @HertzDevil)

Numeric

• Add Number.new overload for String. (#10422, thanks @Blacksmoke16)
• Fix Math.pw2ceil for zero and 64-bit integers. (#10555, thanks @straight-shoota)
• Add #positive? & #negative? to Number and Time::Span. (#10601, thanks @Blacksmoke16)
• Fix imprecise Number#significant algorithm. (#10615, thanks @straight-shoota)
• Add BigFloat's rounding modes. (#10618, thanks @HertzDevil)
• Fix handling of arithmetic overflow in BigDecimal#div. (#10628, thanks @kellydanma)
• Clarify behaviour of unsafe Float-to-number conversions. (#10631, thanks @HertzDevil)
• Fix return type restriction for Number#humanize overload. (#10633, thanks @HertzDevil)
• Fix printf float with with many digits. (#10719, thanks @straight-shoota)
• Add BigDecimal's missing rounding modes. (#10798, thanks @HertzDevil)
• Add support for using big rational #** with unsigned ints. (#10887, thanks @stakach)
• Add overflow detection to BigFloat#to_i64 and #to_u64. (#10630, thanks @HertzDevil)

Text

• (performance) Optimize Levenshtein.distance. (#8324, thanks @r00ster91)
• Refactor: add private Slice#hexdump(io : IO) overload. (#10496, thanks @HertzDevil)
• Restrict MatchData#begin and #end to Int32. (#10656, thanks @straight-shoota)
• Refactor: remove #check_needs_resize from IO::Memory, String::Builder. (#10732, thanks @straight-shoota)
• Fix Base64#encode, exclude last 3 bytes from bswap. (#10752, thanks @kostya)
• Refactor: avoid union type in Char::Reader#decode_char_at. (#10758, thanks @asterite)

Collections

• Add sub/superset checking methods to Hash. (#7500, thanks @Sija)
• Improve documentation of Array#[](Range). (#10243, thanks @straight-shoota)
• Add Steppable module as generalized Number#step. (#10279, thanks @straight-shoota)
• Add docs for #map_with_index. (#10512, thanks @wontruefree)
• Add Array#truncate. (#10712, thanks @HertzDevil)
• Fix: Always copy Hash's default block on #dup and #clone. (#10744, thanks @HertzDevil)
• Apply Array#push's resizing heuristic to #unshift. (#10750, thanks @HertzDevil)
• Refactor index / count normalization in range-like methods. (#10753, thanks @HertzDevil)
• Add methods for cumulative folding and prefix sums. (#10789, thanks @HertzDevil)
• Fix: Pass read-only flag to peeked slice in IO::Memory. (#10891, thanks @z64)

Crypto

• Add methods for getting peer certificates and signatures in OpenSSL. (#8005, thanks @will)
• Add docs for OpenSSL::Cipher. (#9934, thanks @sol-vin)
• Fix format of src/openssl/cipher.cr. (#10705, thanks @straight-shoota)
• Refine documentation for Random#urlsafe_base64. (#10724, thanks @straight-shoota)
• Fix ssl context required for add_x509_verify_flags. (#10756, thanks @stakach)

Time

• Improve error handling for load_localtime on unix. (#10654, thanks @straight-shoota)
• Fix broken call to Time#to_s. (#10778, thanks @straight-shoota)
• Fix Time#shift cover date boundaries with zone offset. (#10871, thanks @straight-shoota)

Files

• Fix and unify documentation for puts. (#10614, thanks @straight-shoota)
• Fix Path#sibling return type. (#10655, thanks @Sija)
• Add Path in FileUtils's methods to match the interfaces it's wrapping. (#10747, thanks @yb66)
• Fix FileDescriptor#pos return Int64 on armv6 ([#10845](https://github.com/crystal-l...