message: ambulance: fix for and
  We should compare the binary serializations rather than the JSON values
  themselves. This fix was already done for CBOR and apparently forgotten
  for MessagePack.
diff: @@ -41,8 +41,8 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
  // parse serialization
  json j2 = json::from_msgpack(vec2);
  - // deserializations must match
  - assert(j1 == j2);
  + // serializations must match
  + assert(json::to_msgpack(j2) == vec2);
  }
  catch (const json::parse_error&)
  {
  