docs: def get_prefix(self, key_prefix, sort_order=None, sort_target=None):
          """Get a range of keys with a prefix.
  
          :param sort_order: 'ascend' or 'descend' or None
          :param key_prefix: first key in range
  
          :returns: sequence of (value, metadata) tuples
          """
          return self.get(key_prefix,
                          metadata=True,
                          range_end=_encode(_increment_last_byte(key_prefix)),
                          sort_order=sort_order,
                          sort_target=sort_target)