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37b7e458c2
redundant string arithmetic in memoized ForeignKey.column method - _pre_existing_column attribute becomes optional, only needed for original Table-bound column, not proxies - compare two ForeignKeys based on target_fullname, don't assume self._colspec is a string - Fixed bug when overriding a Column with a ForeignKey on a reflected table, where derived columns (i.e. the "virtual" columns of a select, etc.) would inadvertently call upon schema-level cleanup logic intended only for the original column. [ticket:1278]