@Test void specialCharsInJson_THRIFT() {
    assertThat(SpanBytesDecoder.THRIFT.decodeOne(SpanBytesEncoder.THRIFT.encode(UTF8_SPAN)))
        .isEqualTo(UTF8_SPAN);
  }
This isn't a test of what we "should" accept as a span, rather that characters that trip-up
json don't fail in codec.
zipkin/src/test/java/zipkin2/codec/V1SpanBytesDecoderTest.java