code: @Override
    public final String escape(String s) {
      checkNotNull(s); // GWT specific check (do not optimize)
      for (int i = 0; i < s.length(); i++) {
        char c = s.charAt(i);
        if ((c < replacementsLength && replacements[c] != null)
            || c > safeMaxChar
            || c < safeMinChar) {
          return escapeSlow(s, i);
        }
      }
      return s;
    }
docs: /*
  This is overridden to improve performance. Rough benchmarking shows that this almost doubles
  the speed when processing strings that do not require any escaping.