karl-police a8047b2e46 keyof - fix LUAU_ASSERT when there's only one key entry (#1388) ... Fixes https://github.com/luau-lang/luau/issues/1387 Was suggested by @alexmccord I changed ``singletons[0]`` to ``singletons.front()``, unsure if that makes a huge difference, and then I added the rest of the things needed for the return type. Maybe it's also the ideal location since doing it before looping through ``keys`` won't add the string into the type arena. I put comments next to it based on how I thought it would make sense. &nbsp; ``LUAU_ASSERT`` seems to trigger when there's only one entry being put inside a UnionType. It's as if it was put there for quality. Allow edits by maintainers is enabled. I tested this with a quick Unit Test something like ```lua local test: keyof<typeof({a="test"})> ```		2024-09-09 13:51:33 -07:00
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include/Luau	Sync to upstream/release/641 (#1382)	2024-08-30 13:16:51 -07:00
src	keyof - fix LUAU_ASSERT when there's only one key entry (#1388)	2024-09-09 13:51:33 -07:00