[Second review] SE-0453: Vector, a fixed size array

[ibex]

@John_McCall

I do not think a 2 or 3 word name of 10-20 characters (such as FixedSizeArray, although I understand the argument for avoiding Array as a suffix) poses a significant usability burden for this type.

Although I like the names Tuple or Vector better, they are shorter, I like these too: HomogenousTuple or FiniteSequence or OrderedFiniteStore.