static SS gazelle_zip(S inputA, S inputB, O... _) {
  O tokenizer = optPar tokenizer(_, gazelle_zip_defaultTokenizer());
  ret gazelle_zipTwoTokenizationsToMap(
    callTokenizer(tokenizer, inputA),
    callTokenizer(tokenizer, inputB));
}

static SS gazelle_zip(Pair<S> inputs, O... _) {
  ret inputs == null ? null : gazelle_zip(inputs.a, inputs.b, _);
}