code: func MustNewTagStringsIterator(inputs ...string) TagIterator {
  	iter, err := NewTagStringsIterator(inputs...)
  	if err != nil {
  		panic(err.Error())
  	}
  	return iter
  }
docs: // MustNewTagStringsIterator returns a TagIterator over a slice of strings,
  // panic'ing if it encounters an error.