Different approaches to read and write unpacked Int64

[am1goo]

Unity Version: 6000.2.6f2
Fish-Networking Version: V4, commit 2742f23 (the latest)
Troubleshooting link in Discord: no link, according to https://fish-networking.gitbook.io/docs/guides/troubleshooting/creating-bug-reports

Actual behaviour:
WriteInt64Unpacked using WriteUInt64 and WriteUnsignedPackedWhole in the nutshell, can write from 1 to 8 bytes and it is not compatible with ReadInt64Unpacked which always read 8 bytes.

Expeceted behaviour:
WriteInt64Unpacked using WriteUInt64Unpacked((ulong)value) to be compatible with ReadInt64Unpacked which always read 8 bytes.