Possible bug with `export-subst' attribute

I have a file with:

  (define archive-id "$Format:%ct|%h|a$")

and an `export-subst' attribute -- and it looks like the "%h" results
in a full sha1 instead of the abbreviated one when used with `git
archive'.  This is with 1.7..2 -- I'm not sure, but I think that it
worked fine with 1.7.1.

-- 
          ((lambda (x) (x x)) (lambda (x) (x x)))          Eli Barzilay:
                    http://barzilay.org/                   Maze is Life!