@Test void differentiatesOnTraceIdWhenTimestampEqual() throws IOException {
    storage.accept(List.of(CLIENT_SPAN)).execute();
    storage.accept(List.of(CLIENT_SPAN.toBuilder().traceId("333").build())).execute();

    assertThat(storage).extracting("spansByTraceIdTimestamp.delegate")
      .satisfies(map -> assertThat((Map) map).hasSize(2));
  }
Ensures we don't overload a partition due to key equality being conflated with order
zipkin/src/test/java/zipkin2/storage/InMemoryStorageTest.java