code: def _add_validator_internal(validator, base_tag):
      "with builtin tag prefixing"
      add_validator(validator, base_tag, tag = u'!~~' + validator.__name__f _add_validator_internal(validator, base_tag):
      "with builtin tag prefixing"
      add_validator(validator, base_tag, tag = u'!~~' + validator.__name__)
docs: with builtin tag prefixing