possible 'git --dirstat=0' buglet in 1.7.0.4?

I noticed just now that the '--dirstat=0' flag still seems to filter
out some diffs, even though I would expect the '0' to mean "don't
filter anything".  If there's another flag that says "don't filter", I
missed it.  Could this be a rounding or off-by-one error?

Mike