Function toNumber

eval/CIPO_evaluation/common/gason.h:68–71

        return ival & JSON_VALUE_PAYLOAD_MASK;
    }
    double toNumber() const {
        assert(getTag() == JSON_NUMBER);
        return fval;
    }
    char *toString() const {
        assert(getTag() == JSON_STRING);
        return (char *)getPayload();