wrong result from path::lexically_normal() for device UNC path

[forworldm]

Describe the bug path("//?/UNC/::1/c$/foo").lexically_normal() returns \\?\UNC\::\1\c$\foo

To Reproduce See above

Expected behavior \\?\UNC\::1\c$\foo

Additional context OS Windows

[gulrak]

I'll look into that. As I'm at a conference in a few days, it might take me until after it to fix it, at least there can not be a release before I'm back.