gason does not work on platforms with tagged pointers (e.g. Android) about gason HOT 2 OPEN

struct JsonValue {
    union {
      uint64_t ival_ = 0;
      double fval_;
    };
    uint8_t tag_ = JSON_NULL;

    JsonValue(double x) : fval_(x), tag_(JSON_NUMBER) {
    }
    JsonValue(JsonTag tag = JSON_NULL, void *payload = nullptr)
        : ival_((uintptr_t)payload), tag_(tag) {
    }
    bool isDouble() const {
        return tag_ == JSON_NUMBER;
    }
    JsonTag getTag() const {
        return (JsonTag)tag_;
    }
    uint64_t getPayload() const {
        assert(!isDouble());
        return ival_;
    }
    double toNumber() const {
        assert(getTag() == JSON_NUMBER);
        return fval_;
    }
    char *toString() const {
        assert(getTag() == JSON_STRING);
        return (char *)getPayload();
    }
    JsonNode *toNode() const {
        assert(getTag() == JSON_ARRAY || getTag() == JSON_OBJECT);
        return (JsonNode *)getPayload();
    }
};