static Set<S> sliceDump_pageNamesIncludingKeys(File f) {
  Set<S> names = ciSet();
  temp CloseableIterableIterator<S> it = linesFromFile(f);
  while (it.hasNext()) pcall {
    S s = trim(it.next());
    if (empty(s)) continue;
    if (startsWith(s, '"'))
      continue with names.add(unquote(s));
    L l = optCast(L, safeUnstructure(s));
    if (l(l) != 3) continue with print("Can't parse: " + s);
    names.add((S) second(l));
  }
  ret names;
}

Began life as a copy of #1024345