0.24.1

New features

• Add ThinLTO support for faster release builds in LLVM 4.0 and above. (#4367, thanks @bcardiff)
• (breaking-change) Add UUID type. Random::Secure.uuid has been replaced with UUID.random. (#4453, thanks @wontruefree)
• Add a BigDecimal class for arbitrary precision, exact, decimal numbers. (#4876 and #5255, thanks @vegai and @Sija)
• Allow Set to work as a case condition, which matches when the case variable is inside the set. (#5269, thanks @makenowjust)
• (breaking-change) Change Time::Format codes to allow more robust options for parsing sub-second precision times. (#5317, thanks @bcardiff)
• Add Time.utc, an alias of Time.new which shortens creating UTC times. (#5321, thanks @straight-shoota)
• Add custom extension support to Tempfile. (#5264, thanks @jreinert)
• Add reduce method to TupleLiteral and ArrayLiteral when using macros. (#5294, thanks @javanut13)
• Export a JSON representation of the documentation in the generated output. (#4746 and #5228, thanks @straight-shoota)
• Make gc/none garbage collection compile again and allow it to be enbled using -Dgc_none compiler flag. (#5314, thanks @ysbaddaden)

Standard library bugs fixed

• Make String#[] unable to read out-of-bounds when the string ends in a unicode character. (#5257, thanks @Papierkorb)
• Fix incorrect parsing of long JSON floating point values. (#5323, thanks @benoist)
• Replace the default hash function with one resistant to hash DoS. (#5146, thanks @funny-falcon)
• Ensure equal numbers always have the same hashcode. (#5276, thanks @akzhan)
• Fix struct equality when two structs descend from the same abstract struct. (#5254, thanks @hinrik)
• Fix URI#full_path not to append a ? unless the query params are nonempty. (#5340, thanks @paulcsmith)
• Fix HTTP::Params.parse to parse && correctly. (#5274, thanks @akiicat)
• Disallow null bytes in ENV keys and values. (#5216, thanks @Papierkorb)
• Disallow null bytes in XML::Node names and content. (#5200, thanks @RX14)
• Fix IO#blocking= on OpenBSD. (#5283, thanks @wmoxam)
• Fix linking programs in OpenBSD. (#5282, thanks @wmoxam)

Compiler bugs fixed

• Stop incorrectly finding top-level methods when searching for a super method. (#5202, thanks @lbguilherme)
• Fix parsing regex literals starting with a ; directly after a call (ex p /;/). (#5208, thanks @makenowjust)
• Correct a case where Expressions#to_s could produce invalid output, causing macro expansion to fail. (#5226, thanks @asterite)
• Give error instead of crashing when self is used at the top level. (#5227, thanks @makenowjust)
• Give error instead of crashing when using instance_sizeof on a generic type without providing it's type arguments. (#5209, thanks @lbguilherme)
• Fix parsing calls when short block syntax (&.foo) is followed by a newline. (#5237, thanks @makenowjust)
• Give error instead of crashing when an unterminated string array literal (%w()) sits at the end of a file. (#5241, thanks @asterite)
• Give error when attempting to use macro yield ({{yield}}) outside a macro. (#5307, thanks @makenowjust)
• Fix error related to generic inheritance. (#5284, thanks @makenowjust)
• Fix compiler crash when using recursive alias and generics. (#5330, thanks @makenowjust)
• Fix parsing foo(+1) as foo + 1 instead of foo(1) where foo was a local variable. (#5336, thanks @makenowjust)
• Documentation generator: Keep quoted symbol literals quoted when syntax highlighting code blocks in documentation output. (#5238, thanks @makenowjust)
• Documentation generator: Keep the original delimiter used when syntax highlighting string array literals. (#5297, thanks @makenowjust)
• Documentation generator: Fix XSS vulnerability when syntax highlighting string array literals. (#5259, thanks @makenowjust)
• Formatter: fix indentation of the last comment in a begin/end block. (#5198, thanks @makenowjust)
• Formatter: fix formatting parentheses with multiple lines in. (#5268, thanks @makenowjust)
• Formatter: fix formatting $1?. (#5313, thanks @makenowjust)
• Formatter: ensure to insert a space between { and % characters to avoid forming {% macros. (#5278, thanks @makenowjust)

Misc

• Fix Makefile, CI, and gitignore to use the new documentation path after #4937. (#5217, thanks @straight-shoota)
• Miscellaneous code cleanups. (#5318, #5341 and #5366, thanks @bew and @mig-hub)
• Documentation fixes. (#5253, #5296, #5300 and #5322, thanks @arcage, @icyleaf, @straight-shoota and @bew)
• Fix the in-repository changelog to include 0.24.0. (#5331, thanks @sdogruyol)