Fix missing variance check for abstract set with asymmetric type #15157
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Closes GH-15140
The first commit is a cleanup and fix of a related issue, in preparation of the actual fix in the second commit. The check is a bit out of place. I also thought about inheriting the abstract method and removing it during inheritance when the check succeeds, but this would 1. require delaying the abstract checks after variance checks, and 2. require dealing with freeing of potentially duplicated static methods and the hooks list.
Anyway, I'll think about this again in some more detail.