Function WriteVarInt64

library/cpp/yson/varint.cpp:31–33

    }

    int WriteVarInt64(IOutputStream* output, i64 value) {
        return WriteVarUInt64(output, static_cast<ui64>(ZigZagEncode64(value)));
    }

    int ReadVarUInt64(IInputStream* input, ui64* value) {
        size_t count = 0;