Feature request: a merge strategy that makes any file difference a merge conflict

[Michael Ernst <mernst@cs.washington.edu>]

Git's built-in merge strategies, such as ort, sometimes create a
clean-but-incorrect merge.  A merge driver or a mergetool cannot be
used to correct such problems, because a merge driver or mergetool is
only called when the strategy resulted in a conflict (so far as I
understand).  It is challenging to write a merge strategy, but it is
much easier to write a merge driver or a mergetool.

If git had a strategy that always caused a merge conflict (even when
the differences are mergeable), then a merge driver or mergetool would
be called on every file difference.  This effectively permits a user
to completely replace git's merge strategy, without the difficulty of
writing a merge strategy.

I realize that the proposed strategy would likely only create merge
conflicts when no two of {parent1,parent2,base} are the same -- that
is, only when the low-level merge driver `git merge-file` is called.
That is fine with me.

What do you think of this feature request?

Thanks in advance,
-Mike