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77db0ef6ac
🎫`3341` where in the unusual case of a constraint that refers to a mixture of :class:`.Column` objects and string column names at the same time, the auto-attach-on-column-attach logic will be skipped; for the constraint to be auto-attached in this case, all columns must be assembled on the target table up front. Added a new section to the migration document regarding the original feature as well as this change. fixes #3411