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428dfeee48
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
(cherry picked from commit 421fa6b8bf)