@Test void debugWins() {
    CollectorSampler sampler = CollectorSampler.create(0.0f);

    assertThat(sampler.isSampled("8000000000000000", true)).isTrue();
  }
Math.abs("8000000000000000") returns a negative, we coerse to "7fffffffffffffff" to avoid
always dropping when trace_id == "8000000000000000"
zipkin-collector/core/src/test/java/zipkin2/collector/CollectorSamplerTest.java