Release Notes for 438

Add CollisionGroup property to RaycastParams. This allows you to set a collision group for outgoing raycasts.

Improve the reliability of the TextLabel/TextButton/TextBox TextBounds/TextFits properties

xpcall's second argument is now verified to be a function __tostring has to return a string now for tostring() to work

Using non-string hash keys in Luau is now noticeably faster than it used to be.

_VERSION is now set to "Luau"

Microprofiler dump edge case improvements and bugfixes. Tooltip averages are now more accurate in some edge cases.