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Some of the dialect impl memoization for TypeDecorator necessarily keeps the top-level TypeDecorator type around, since a user-defined type will have bind and result set processing behavior. For both TypeDecorator and Variant, PG dialect needs to ensure it's looking at the SQLAlchemy type to check for SmallInteger / BigInteger. Fixes: 3739 Change-Id: I2d45fb997f17c6272d6bb826a77d2dba665adae7