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The :paramref:`.Enum.create_constraint` and :paramref:`.Boolean.create_constraint` parameters now default to False, indicating when a so-called "non-native" version of these two datatypes is created, a CHECK constraint will not be generated by default. These CHECK constraints present schema-management maintenance complexities that should be opted in to, rather than being turned on by default. Fixes: #5367 Change-Id: I0a3fb608ce32143fa757546cc17ba2013e93272a