[PATCH 6 of 6] dirs: use mutable strings internally

[Bryan O'Sullivan]

On Mon, Apr 1, 2013 at 1:49 PM, Bryan O'Sullivan <bos at serpentine.com> wrote:

> hg update (with nothing to do)
>   Python    2800 msec
>   C+int+str 2240
>

This measurement is incorrect - there are cases where update will speed up
by this amount, but I simply measured the wrong baseline here.
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