Build union of two maps/sets by mutating the larger one, not the first #163
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`fn union(self, other: Self) -> Self` is implemented by progressively mutating then returning one of the two given collections, while consuming and iterating the other. If one of the two collections is much larger, mutating that one can be faster and yield better reuse of internal nodes.
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fn union(self, other: Self) -> Selfis implemented by progressively mutating then returning one of the two given collections, while consuming and iterating the other.If one of the two collections is much larger, mutating that one can be faster and yield better reuse of internal nodes.