Function getPayload

eval/CIPO_evaluation/common/gason.h:64–67

        return isDouble() ? JSON_NUMBER : JsonTag((ival >> JSON_VALUE_TAG_SHIFT) & JSON_VALUE_TAG_MASK);
    }
    uint64_t getPayload() const {
        assert(!isDouble());
        return ival & JSON_VALUE_PAYLOAD_MASK;
    }
    double toNumber() const {
        assert(getTag() == JSON_NUMBER);
        return fval;