Breaking changes of ForwardAgent path parsing

[buglloc]

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Hi, update to V8.9.1.0p1-Beta breaks backward compatibility of parsing the ForwardAgent path.

• On V8.6.0.0p1-Beta:

C:\Users\buglloc
λ C:\Users\buglloc\Downloads\V8.6.0.0p1-Beta\ssh.exe -V
OpenSSH_for_Windows_8.6p1, LibreSSL 3.3.3

C:\Users\buglloc
λ C:\Users\buglloc\Downloads\V8.6.0.0p1-Beta\ssh.exe "-oForwardAgent=\\.\pipe\openssh-ssh-agent" github.com
[email protected]: Permission denied (publickey).

C:\Users\buglloc
λ C:\Users\buglloc\Downloads\V8.6.0.0p1-Beta\ssh.exe "-oForwardAgent=\\\\.\pipe\openssh-ssh-agent" github.com
Cannot forward agent socket path "\\\\\\\\.\\pipe\\openssh-ssh-agent": Unknown error
[email protected]: Permission denied (publickey).

• On V8.9.1.0p1-Beta :

C:\Users\buglloc
λ C:\Users\buglloc\Downloads\V8.9.1.0p1-Beta\ssh.exe -V
OpenSSH_for_Windows_8.9p1, LibreSSL 3.4.3

C:\Users\buglloc
λ C:\Users\buglloc\Downloads\V8.9.1.0p1-Beta\ssh.exe "-oForwardAgent=\\.\pipe\openssh-ssh-agent" github.com
Cannot forward agent socket path "\\.\\pipe\\openssh-ssh-agent": No such file or directory
[email protected]: Permission denied (publickey).

C:\Users\buglloc
λ C:\Users\buglloc\Downloads\V8.9.1.0p1-Beta\ssh.exe "-oForwardAgent=\\\\.\pipe\openssh-ssh-agent" github.com
[email protected]: Permission denied (publickey).

Which path should I use to be compatible with both (and future) versions? May I use //./pipe/<pipe_name> for example?