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+---
+layout: single
+title:  "Luau Recap: September 2021"
+---
+
+Luau is our new language that you can read more about at [https://luau-lang.org](https://luau-lang.org).
+
+[Cross-posted to the [Roblox Developer Forum](https://devforum.roblox.com/t/luau-recap-september-2021/).]
+
+## Editor features
+
+We have made some improvements to the Luau-powered autocomplete beta feature in Roblox Studio:
+
+ * We no longer give autocomplete suggestions for client-only APIs in server-side scripts,
+   or vice versa.
+ * For table literals with known shape, we provide autocomplete suggestions for properties.
+ * We provide autocomplete suggestions for `Player.PlayerGui`.
+ * Keywords such as `then` and `else` are autocompleted better.
+ * Autocompletion is disabled inside a comment span (a comment starting `--[[`).
+
+## Typechecking improvements
+
+The big news this month is that generic functions are back!
+
+*write-up of generics goes here*
+
+In other typechecking news:
+
+ * The Luau constraint resolver can now refine the operands of equality expressions.
+ * We fixed some crashes caused by UAF during type inference.
+ * We do a better job of tracking updates when script is moved inside the data model.
+ * We fixed one of the ways that [recursive types could cause free types to leak](https://devforum.roblox.com/t/free-types-leaked-into-this-modules-public-interface/1459070).
+ * We improved the way that `return` statements interact with mutually recursive
+   function declarations.
+ * We improved parser recovery from code which looks like a function call (but isn't) e.g.
+```
+local x = y
+(expr)[smth] = z
+```
+ * We consistently report parse errors before type errors.
+ * We display more types as `*unknown*` rather than as an internal type name like `error####`.
+ * Luau now infers the result of `Instance:Clone()` much more accurately.
+ * Luau type guard refinements now support more arbitrary cases, for instance `typeof(foo) ~= "Instance"` eliminates anything not a subclass of Instance.
+
+
+## Performance improvements
+
+ * We optimized the performance of the `Vector3.new` constructor.
+
+## Other improvements
+
+ * We fixed some GC issues where objects could become "zombies".
+ * We relaxed the Parallel Lua constraints when dispatching deferred events.