'This particular override stops us sending DEFAULTs for BLOB/TEXT columns.'

def _field_sanity(self, field):

    type = self._db_type_for_alter_column(field).lower()
    is_geom = (True in [(type.find(t) > (-1)) for t in self.geom_types])
    is_text = (True in [(type.find(t) > (-1)) for t in self.text_types])
    if (is_geom or is_text):
        field._suppress_default = True
    return field
