Allows writing to ordered sets by index. The total number of elements never changes as a result of such an operation - a consequence of which is that if multi==false, changing the value to one that's already in the set is an error.
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Allows writing to ordered sets by index. The total number of elements never changes as a result of such an operation - a consequence of which is that if multi==false, changing the value to one that's already in the set is an error.