Issue #11906 has been updated by Nobuyoshi Nakada.


And on Windows, note that `\\foo\bar` is a valid UNC style path, but `\\\foo\bar` is not.

----------------------------------------
Bug #11906: File.dirname separator stripping from the begining of path
https://bugs.ruby-lang.org/issues/11906#change-55888

* Author: Karol Bucek
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 2.3.0
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
MRI strips additional leading slashes with `File.dirname` :

```
File.dirname "////foo/bar/baz"   # => /foo/bar
File.dirname "////foo//bar/baz"  # => /foo//bar
```
... issue arose as an incompatibility on JRuby's tracker: https://github.com/jruby/jruby/issues/2391
is the current behaviour really intended?



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