[PATCH 4 of 4] dirstate: speed up case collision checking

[Bryan O'Sullivan]

On Mon, Jun 25, 2012 at 5:43 PM, Bryan O'Sullivan <bos at serpentine.com>wrote:

>
> os.path.dirname is definitely not safe to use here.
>

It looks like I was reading the wrong code when making this assertion. The
ntpath code for dirname in Python actually does handle both '/' and '\'.
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