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+# Relaxing type assertions
+
+## Summary
+
+The way `::` works today is really strange.  The best solution we can come up with is to allow `::` to convert between any two types.
+
+## Motivation
+
+The current Luau implementation of the `::` operator is a little bit strange.  Due to an accident, it can only be used for downcasts and casts to `any`.
+
+This is unfortunate because it works in many cases where users feel that it should, but doesn't actually make a whole lot of sense when scrutinized.
+
+```lua
+local t = {x=0, y=0}
+
+local a = t :: {x: number, y: number, z: number} -- OK
+local a = t :: {x: number} -- Error: This is an upcast!
+```
+
+Originally, we intended for type assertions to only be useful for upcasts.  This would make it consistent with the way annotations work in OCaml and Haskell and
+would never break soundness.  However, users have yet to report this oddity!  It is working correctly for them!
+
+We must conclude that users are not interested in explicit upcasting syntax.  Only downcasts and "samecasts" (a cast from a type to itself) are interesting.
+
+## Design
+
+I propose that we change the meaning of the `::` operator to permit _any coersion whatsoever_.  The `::` operator thus becomes morally equivalent to using `any`:
+scripts that include either cannot be assumed to be sound.
+
+## Drawbacks
+
+`::` was originally envisioned to be a way for users to make the type inference engine work smarter and better for them.  Making all casts succeed
+thoroughly puts an end to that goal.  This is acceptable because nobody seems to be interested in using it that way anyway.
+
+## Alternatives
+
+We could simply update `::` to act the way it was originally envisioned.  This would break some code in lua-apps, where it is expressly used to perform a downcast. This would satisfy this RFR author, but leaves open the problem of how to perform a downcast in Luau.  If we were to go ahead with this plan, programmers would have to write `(foo :: any) :: TargetType` to effect a downcast.
+
+We could introduce yet another operator expressly for downcasts, but we'd have to come up with its name and explain the difference to end users.