message: rotating_light: removing a compiler warning
diff: @@ -6660,7 +6660,7 @@ class serializer
  return;
  }
  - const bool is_negative = x < 0;
  + const bool is_negative = std::is_same<NumberType, number_integer_t>::value and (x < 0);
  std::size_t i = 0;
  // spare 1 byte for '\0'
  