assertOrder(X_LT_Y, "1.0m1", "1.0");
        assertOrder(X_LT_Y, "1.0-m1", "1.0");
        assertOrder(X_LT_Y, "1.0.m1", "1.0");

        assertOrder(X_GT_Y, "1.0a.1", "1.0");
        assertOrder(X_GT_Y, "1.0a-1", "1.0");
        assertOrder(X_GT_Y, "1.0b.1", "1.0");
        assertOrder(X_GT_Y, "1.0b-1", "1.0");
        assertOrder(X_GT_Y, "1.0m.1", "1.0");
        assertOrder(X_GT_Y, "1.0m-1", "1.0");

        checkVersionsEqual("1a", "1-a");
        checkVersionsEqual("1a", "1.0-a");
        checkVersionsEqual("1a", "1.0.0-a");
        checkVersionsEqual("1.0a", "1-a");
        checkVersionsEqual("1.0.0a", "1-a");
        checkVersionsEqual("1x", "1-x");
        checkVersionsEqual("1x", "1.0-x");
        checkVersionsEqual("1x", "1.0.0-x");
        checkVersionsEqual("1.0x", "1-x");

     */
    internal fun StringBuilder.appendQuotedString(key: String) {
      append('"')
      for (i in 0 until key.length) {
        when (val ch = key[i]) {
          '\n' -> append("%0A")
          '\r' -> append("%0D")
          '"' -> append("%22")
          else -> append(ch)
        }
      }
      append('"')
    }
  }