Re: [PATCH 1/6] commit_graft_pos(): take an oid instead of a bare hash

> All of our callers have an object_id, and are just dereferencing the
> hash field to pass to us. Let's take the actual object_id instead. We
> still access the hash to pass to hash_pos, but it's a step in the right
> direction.
> 
> This makes the callers slightly simpler, but also gets rid of the
> untyped pointer, as well as the now-inaccurate name "sha1".
> 
> Signed-off-by: Jeff King <peff@peff.net>
> ---
> I think this one is an obvious cleanup that we'd want whether we go
> further in the series or not.