New Issue: Should we get rid of localSubdomain in favor of localSubdomains iterator

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19178, "stonea", "Should we get rid of localSubdomain in favor of localSubdomains iterator", "2022-02-04T00:56:28Z"

The Array type has both a localSubdomain method and a localSubdomains iterator. This seems redundant. Perhaps we should get rid of localSubdomain?