Fix union type assignments #2076
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Closes #2074
I've noticed we're processing the
isValueType(to)type to early, before completely "unwrapping" thefromtype. This eventually leads to some code which tries to assert that a union type can be assigned to a single value, which will quickly result in failure.This change adjusts the order to move the unwrapping of the
totype after the unwrapping of thefromtype.