roblox-lua-promise v3.0.0 Release Candidate 1

Changed

• Runtime errors are now represented by objects. You must call tostring on rejection values before assuming they are strings (this was always good practice, but is required now).
• Yielding is now allowed in Promise.new, andThen, and Promise.try executors.
• Errors now have much better stack traces due to using xpcall internally instead of pcall.
• Stack traces will now be more direct and not include as many internal calls within the Promise library.
• Chained promises from resolve() or returning from andThen now have improved rejection messages for debugging.
• Promise.async has been renamed to Promise.defer (Promise.async references same function for compatibility)
• Promises now have a __tostring metamethod, which returns Promise(Resolved) or whatever the current status is.
• Promise:timeout() now rejects with a Promise.Error(Promise.Error.Kind.TimedOut) object. (Formerly rejected with the string "Timed out")
• Attaching a handler to a cancelled Promise now rejects with a Promise.Error(Promise.Error.Kind.AlreadyCancelled). (Formerly rejected with the string "Promise is cancelled")
• Let Promise:expect() throw rejection objects

Added

• New Promise Error class is exposed at Promise.Error, which includes helpful static methods like Promise.Error.is.
• Added Promise:now() (#23)
• Added Promise.each (#21)
• Added Promise.retry (#16)
• Added Promise.fromEvent (#14)
• Improved test coverage for asynchronous and time-driven functions

Fixed

• Changed Promise.is to be safe when dealing with tables that have an __index metamethod that creates an error.
• Promise.delay resolve value (time passed) is now more accurate (previously passed time based on when we started resuming threads instead of the current time. This is a very minor difference.)