@Test void normalizeTraceId_badCharacters() {
    assertThatExceptionOfType(IllegalArgumentException.class).isThrownBy(() -> {
      normalizeTraceId("000-0000000004d20000000ss000162e");
    });
  }
Some tools like rsocket redundantly pass high bits as zero.
zipkin/src/test/java/zipkin2/SpanTest.java