Make PromiseIndex a nominal typing, require explicit construction #260
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Fix #118 . Makes PromiseIndex a nominal type, which is different from bigint or number. User cannot construct such a type, unless force typecast
x as unknown as PromiseIndex. Since typescript cannot really prevent user force typecast to an exported type, I think it's the closest semantics to "There should be no way to manually construct a promise index, (PromiseIndex) are only constructed by those functions" suggested by @austinabell