Re: invalid tree and commit object

René Scharfe [off-list ref] writes:

Would a stack work?  When we see a candidate non-directory, we put
it on the stack.  When we see a candidate directory, we compare it
to the entry at the top of the stack using strcmp().  Equality
indicates a duplicate and we are done.  If the directory name is
less then we can pop the entry from the stack and check again, as
we're past the point where a duplicate would be.  Makes sense?

Perfectly and quite excited ;-)  I wonder if we can do the same in
the unpack-trees side.