0.552

Analysis Changes

• Reduce the stack utilization of type checking.
• Improve the error message that's reported when a delimiting comma is missing from a table literal. eg

local t = {
    first = 1
    second = 2
}

0.551

Analysis changes

• Fixed issue with all dependent modules not being invalidated when using Frontend::markDirty #719
• Improved Failed to unify type packs error message to be reported as Type pack 'X' could not be converted into 'Y'
• Add named parameters to math library functions #722
• All thrown exceptions by Luau analysis are now derived from Luau::InternalCompilerError
• When a call site has fewer arguments than required, error reports the location of the function name instead of the argument to the function
• Fixed documentation symbols not added to exported types in declaration files if they are referenced in a declared global

Runtime changes

• Removed a check in fast call dispatch that reduces executed instruction count by 1% in benchmarks
• Additional fixes to reported error location of OOM errors in VM
• Improved math.sqrt, math.floor and math.ceil performance on additional compilers and platforms (1-2% geomean improvement in benchmarks, including 8-9% on 'math-cordic')

Community contributions

• Use overloaded documentation symbol for class methods/table props by @JohnnyMorganz in #724

0.550

Analysis changes

• Improve type checking performance for complex overloaded functions

Runtime changes

• Fix rare cases of incorrect stack traces for out of memory errors at runtime

Community contributions

• Support ["prop"] syntax on class definitions in definition files by @JohnnyMorganz in #704

0.549

Analysis changes

• Type errors that mention function types no longer have redundant parenthesis around return type

Runtime changes

• Reoptimized math.min/max/bit32 builtins assuming at least 2 arguments are used (1-2% lift on some benchmarks)
• Luau REPL now supports --compile=remarks which displays the source code with optimization remarks embedded as comments
• Builtin calls are slightly faster when called with 1-2 arguments (~1% improvement in some benchmarks)

Community contributions

• Fix segfault in loadDefinition for unit tests by @JohnnyMorganz in #705

0.548

Analysis changes

• Fix rare type checking bugs with invalid generic types escaping the module scope
• Fix type checking of variadic type packs in certain cases
• Implement type normalization, which resolves a large set of various issues with unions/intersections in type checker
• Improve parse errors for trailing commas in function calls and type lists

Runtime changes

• Improve performance of lua_getinfo (debug.info, debug.traceback and profiling overhead are now 20% faster/smaller)
• Improve performance of polymorphic comparisons (1-2% lift on some benchmarks)
• Improve performance of closure creation (1-2% lift on some benchmarks)
• Improve string comparison performance (4% lift on string sorting)
• Reduce profiling skew when using --profile with very high frequencies

Community contributions

None this week; PRs are always welcome!

0.547

Analysis changes

• Type aliases can no longer override primitive types; attempts to do that will result in a type error
• Fix misleading type error messages for mismatches in expression list length during assignment
• Fix incorrect type name display in certain cases

Runtime changes

• setmetatable/getmetatable are now ~2x faster
• tools/perfstat.py can be used to display statistics about profiles captured via --profile switch

Community contributions

None this week; PRs are always welcome!

0.546

Runtime changes

• Add lua_rawiter for faster table iteration from C (~2x faster than lua_next, results in the same iteration order if the table isn't modified during traversal)

Community contributions

• Add lua_cleartable by @petrihakkinen in #678

0.545

Analysis changes

• Improve type error messages for argument count mismatch in certain cases
• Fix type checking variadic returns when the type is incompatible which type checked in certain cases

Runtime changes

• Reduce size of upvalue objects by 8 bytes on 64-bit platforms
• Reduce I$ footprint of interpreter by 1.5 KB by removing support for bytecode v2
• Reduce GC pause during atomic stage for programs with a lot of threads

Community contributions

• Add lua_rawsetfield by @petrihakkinen in #671

0.544

Analysis changes

• Remove type definitions of utf8.nfcnormalize/nfdnormalize/graphemes that aren't supported by standalone Luau library

Runtime changes

• Add lua_costatus to retrieve extended thread status (similar to coroutine.status)
• Improve GC sweeping performance (2-10% improvement on allocation-heavy benchmarks)

Community contributions

None this week; PRs are always welcome!

0.543

Analysis changes

• Improve type checking stability
• Improve ComparisonPrecedence lint suggestions for three-way comparisons (X < Y < Z)
• Improve location information for errors when parsing invalid type annotations

Runtime changes

• Compiler can no longer be configured to generate bytecode version 2; runtime support for version 2 will be removed in a future release
• Improve performance of comparisons against numeric constants on AArch64

Community contributions

• Fix overloaded metamethod in class definitions by @JohnnyMorganz in #653