0.725

Hi everyone! The Luau team has been flibbertigibbeting and recombobulating this week to bring another release to you!

Check out what's new:

Analysis

• Fixes an error where Luau script analysis would sometimes incorrectly infer that Library.table.unpack returns ...unknown
• Writing a recursive generic type alias with the wrong number of generics now reports one more specific error rather than two.
• Fixed a crash that could happen when normalizing an exceptionally large negated type.
• Improved performance in constraint solving when reducing large nested type functions.
• Fixed a crash that could happen when combining export and class.
• Fix CFG dump printing type guards backwards by @7Duser in #2438

Compiler & Runtime

• Luau C API will now auto-reserve required stack slots to reduce API errors, eliminating the need for manual stack management with lua_checkstack
• Add support for yieldable protected C calls for custom Luau libraries via luaL_pcallyieldable
• NCG: Remove the use of shared execution callback data for register spills
• Updates the garbage collector to visit cached tagged userdata metatables, preventing premature collection and making the lua_setuserdatametatable API less error-prone.
• Fixed two compiler crashes related to export.

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As always, thanks to all our contributors, and happy pride and FIFA world cup!!! 🏳️‍🌈 ⚽️ 🏆

Co-authored-by: Andy Friesen afriesen@roblox.com
Co-authored-by: Annie Tang annietang@roblox.com
Co-authored-by: Ariel Weiss arielweiss@roblox.com
Co-authored-by: Hunter Goldstein hgoldstein@roblox.com
Co-authored-by: Sora Kanosue skanosue@roblox.com
Co-authored-by: Thomas Schollenberger tschollenberger@roblox.com
Co-authored-by: Varun Saini vsaini@roblox.com
Co-authored-by: Vighnesh Vijay vvijay@roblox.com
Co-authored-by: Vyacheslav Egorov vegorov@roblox.com

Full Changelog: 0.724...0.725