Method PushBack

include/cereal/external/rapidjson/internal/biginteger.h:234–237

    }

    void PushBack(Type digit) {
        CEREAL_RAPIDJSON_ASSERT(count_ < kCapacity);
        digits_[count_++] = digit;
    }

    static uint64_t ParseUint64(const char* begin, const char* end) {
        uint64_t r = 0;