static S dropGlobalID(S s) {
  s = rtrim(s);
  if (!endsWith(s, "]")) ret s;
  Matcher m = regexpMatcher("\\[id: [a-z]{" + globalIDLength() + "}\\]$", s);
  ret m.find() ? rtrim(takeFirst(regexpMatcherIndex(m), s)) : s;
}