Re: [PATCH v3 3/3] commit::print_summary(): set rev_info.always_show_header to 1

Tay Ray Chuan [off-list ref] writes:

 - mention the die() and our assumption that it won't be triggered, as
   suggested by Junio.

What I meant was to state that in the die() message, not in the commit
log, so that a bug reporter (or preferably people hacking on git that
introduces a regression to trigger this die()) can quickly diagnose what
assumption this new code relies on was violated.