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01c50c64e3
Finalize all remaining removed-in-2.0 changes so that we can begin doing pep-484 typing without old things getting in the way (we will also have to do public_factory). note there are a few "moved_in_20()" and "became_legacy_in_20()" warnings still in place. The SQLALCHEMY_WARN_20 variable is now removed. Also removed here are the legacy "in place mutators" for Select statements, and some keyword-only argument signatures in Core have been added. Also in the big change department, the ORM mapper() function is removed entirely; the Mapper class is otherwise unchanged, just the public-facing API function. Mappers are now always given a registry in which to participate, however the argument signature of Mapper is not changed. ideally "registry" would be the first positional argument. Fixes: #7257 Change-Id: Ic70c57b9f1cf7eb996338af5183b11bdeb3e1623