if (safeMax < safeMin) {
      // If the safe range is empty, set the range limits to opposite extremes
      // to ensure the first test of either value will (almost certainly) fail.
      safeMax = Character.MIN_VALUE;
      safeMin = Character.MAX_VALUE;
    }
    this.safeMin = safeMin;
    this.safeMax = safeMax;
  }

  /*
   * This is overridden to improve performance. Rough benchmarking shows that this almost doubles

        path1              | offset | path2         | result
        "/var/hello/world" | 5      | "hello-other" | -1
    }

    def "equal chars are equal"() {
        expect:
        (Character.MIN_VALUE..Character.MAX_VALUE).each { currentChar ->
            assert compareCharsIgnoringCase(currentChar as char, currentChar as char) == 0
            assert compareChars(currentChar as char, currentChar as char) == 0

    // (Unicode code points above \uFFFF are represented via surrogate pairs
    // which means they are treated as pairs of safe characters).
    builder.setSafeRange(Character.MIN_VALUE, '\uFFFD');
    // Unsafe characters are replaced with the Unicode replacement character.
    builder.setUnsafeReplacement("\uFFFD");

    /*