[PATCH 1 of 3 V3] ancestor: add faster algorithm for computing difference of ancestor sets

[Bryan O'Sullivan]

On Mon, Nov 26, 2012 at 12:00 PM, Siddharth Agarwal <sid0 at fb.com> wrote:

> ancestor: add faster algorithm for computing difference of ancestor sets
>

I just pushed this series to crew, with minor edits. Nice work!
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