17720, "ben-albrecht", "Non-nilable types in resized arrays, associative arrays, and sparse arrays", "2021-05-13T16:18:04Z"
This is a continuation of #15394 to track the last mile of the type-collection
matrix marathon. Since the creation of #15394, it has been determined that
resized arrays, assoc arrays, and possibly sparse arrays should support
non-nilable types.
â = currently works
â = currently does not work
ð¹ = not expected to work
â = still up for debate on whether it is expected to work (â) or not (ð¹)