Unix.readlink add \??\ when resolving symlink on Windows

[vicuna]

Original bug ID: 7906
Reporter: saitonakamura
Assigned to: @dra27
Status: confirmed (set by @dra27 on 2019-01-30T07:12:23Z)
Resolution: open
Priority: normal
Severity: minor
OS: Windows
OS Version: 10
Category: standard library
Duplicate of: #7518
Monitored by: @nojb @gasche

Bug description

Unix.readlink("C:\Users\saito\mylink") results in "??\C:\Users\saito\code" instead of "C:\Users\saito\code"

Steps to reproduce

On windows

1. Open cmd as administrator
2. Create a symlink to directory (e.g. mklink /D mylink C:\Users\saito\code)
3. Resolve it using Unix.readlink (e.g. Unix.readlink("C:\\Users\\saito\\mylink")

Additional information

I'm not sure if it's reproducible on every Windows of just on my machine

[github-actions]

This issue has been open one year with no activity. Consequently, it is being marked with the "stale" label. What this means is that the issue will be automatically closed in 30 days unless more comments are added or the "stale" label is removed. Comments that provide new information on the issue are especially welcome: is it still reproducible? did it appear in other contexts? how critical is it? etc.