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Fixes an issue where a Column would be copied with unique=True and at the same time the UniqueConstraint would also be copied, leading to duplicate UniqueConstraints in the target table, when tometadata() is used. Imitates the same logic used by index=True/Index to avoid duplicates. For some reason a fix was implemented for Index long ago but never for UniqueConstraint. Change-Id: Ie622ee912a6fb8bf0ea900a8b09d78c7ebc79fc0 Fixes: #3721