docs: def wrap_value(self, value):
          ''' A function used to wrap a value used in a comparison.  It will
              first try to wrap as the sequence's sub-type, and then as the
              sequence itself'''
          try:
              return self.item_type.wrap_value(value)
          except BadValueException:
              pass
          try:
              return self.wrap(value)
          except BadValueException:
              pass
          self._fail_validation(value, 'Could not wrap value as the correct type.  Tried %s and %s' % (self.item_type, self))