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The column conflict resolution technique discussed at :ref:`declarative_column_conflicts` is now functional for a :class:`.Column` that is also a primary key column. Previously, a check for primary key columns declared on a single-inheritance subclass would occur before the column copy were allowed to pass. Fixes: #4352 Change-Id: Id4c025da53c28e58db6b549fe398f25f8a90d355 Pull-request: https://github.com/zzzeek/sqlalchemy/pull/483