code: def is_sqlatype_binary(coltype: Union[TypeEngine, VisitableType]) -> bool:
      
      # Several binary types inherit internally from _Binary, making that the
      # easiest to check.
      coltype = _coltype_to_typeengine(coltype)
      # noinspection PyProtectedMember
      return isinstance(coltype, sqltypes._Binary)
docs: Is the SQLAlchemy column type a binary type?