optimizing fsfs: reverse diffs?

Hi all,

  FSFS is great, but I'm a little worried about checkout slowdown, especially as a project ages. Instead of reconstructing the current revision each time from an ever-lengthening sequence of forward diffs, why doesn't FSFS optimize for the common case and store the full current revision and a sequence of reverse diffs? (Ala rdiff-backup: http://www.nongnu.org/rdiff-backup/.)

  I'll pack my bags & go to dev with this question if you think I should. :) Thought I'd try here first though.

-- 
Alan Grow
Software Engineer / 
Opensource Consultant
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