static S camelCase(L<S> words) {
  new StringBuilder buf;
  for i over words: {
    S word = words.get(i);
    word = toLower(word);
    buf.append(i == 0 ? word : firstToUpper(word));
  }
  ret str(buf);
}

static S camelCase(S words) {
  ret camelCase(words(words));
}