0.568

Analysis Changes

• A small subset of control-flow refinements have been added to recognize type options that are unreachable after a conditional/unconditional code block. (Fixes #356).

Some examples:

local function f(x: string?)
    if not x then return end

    -- x is 'string' here
end

Throwing calls like error or assert(false) instead of 'return' are also recognized.
Existing complex refinements like type/typeof and tagged union checks are expected to work, among others.

To enable this feature, LuauTinyControlFlowAnalysis exclusion has to be removed from ExperimentalFlags.h.
If will become enabled unconditionally in the future.

• Linter has been integrated into the typechecker analysis so that type-aware lint warnings can work in any mode
  Frontend::lint methods were deprecated, Frontend::check has to be used instead with runLintChecks option set.
  Resulting lint warning are located inside CheckResult.

• Part of Type error suppression RFC was implemented making subtyping checks with any type transitive.

Runtime Changes

• Fixed large performance drop and increased memory consumption when array is filled at an offset (Fixes #590)

For extra notes about internal development, you can read #865

0.567

What's Changed

• Fixed lerp() duplicate when compiling for C++20 by @niansa in #851
• Fixed LUAU_ASSERT failure in luaG_getline if called from lua_Alloc #850
• Recover AST of a declarations file #817
• Optimize math.floor/ceil/round with SSE4.1
  • Results in a ~7-9% speedup on the math-cordic benchmark.
• Optimized table.sort.
  • table.sort is now ~4.1x faster (when not using a predicate) and ~2.1x faster when using a simple predicate. Performance may improve further in the future.
• Reorganize the memory ownership of builtin type definitions.
  • This is a small initial step toward affording parallel typechecking.

New Contributors

• @niansa made their first contribution in #851

Full Changelog: 0.566...0.567

0.566

Analysis Changes

• DeprecatedApi lint can report some issues without type inference information
• Marked table.getn/foreach/foreachi as deprecated (RFC: Deprecate table.getn/foreach/foreachi)

Runtime Changes

• With -O2 optimization level, we now optimize builtin calls based on known argument/return count.
  Note that this change can be observable if getfenv/setfenv is used to substitute a builtin, especially if arity is different.
  Fastcall heavy tests show a 1-2% improvement.

Other changes

• Fixed incorrect lexeme generated for string parts in the middle of an interpolated string (Fixes #744)
• Luau can now be built with clang-cl (Fixes #736)
• Fixed performance of autocomplete requests when suggestions have large intersection types (Solves https://github.com/Roblox/luau/discussions/847)

For extra notes about internal development, you can read #853

0.565

What's Changed

• docs: update readme installation guide by @bmg817 in #792
• Improve stack consumption when typechecking nested method calls
• Remove redundant jump instructions in code using conditional break and continue statements.

New Contributors

• @bmg817 made their first contribution in #792

0.564

What's Changed

• Sync to upstream/release/564 by @vegorov-rbx in #841

0.563

What's Changed

• Fix comments on jump instructions with AUX by @EpixScripts in #808
• Fix a bug where reading a property from an unsealed table caused inference to improperly infer the existence of that property.
• Fix unknown global cannot be identified when using type and typeof #827

New Contributors

• @EpixScripts made their first contribution in #808

0.562

Language Changes

A new language feature - string interpolation, is now stable and available for use in default configuration.
Read more about it in the announcement.

Analysis Changes

• Fixed rare use-after-free in analysis during table unification

For extra notes about internal development, you can read #828

0.561

What's Changed

• Fix a potential debugger crash by adding checks for invalid stack index values

0.560

Autocomplete Changes

• Additional information is included in Scope for type alias name locations and names of imported modules
• Improved suggestions in 'for' and 'while' loop headers

Analysis Changes

• String match functions return types are now optional strings and numbers because match is not guaranteed at runtime

Runtime Changes

• Fix lua_*upvalue() when upvalue names aren't in debug info by @HaroldCindy in #787

Other Changes

• Fixed build issue on gcc 11 and up (Fixes #806)

0.559

Autocomplete Changes

• Fix autocompletion of if-then-else expressions
• Pass string content to autocomplete callback by @JohnnyMorganz in #800
• Attach definition location to TableType by @JohnnyMorganz in #801

Runtime Changes

• Fix a potential crash surrounding improper use of %* in a string format specifier
• Improved error handling for string interpolation with too many arguments

Other Changes

• All Python scripts now invoke Python via python3 rather than python