In order of preference
2 or 3: fixup misaligned accesses
4 or 5: SIGBUS the process in question, rather than silently giving
the wrong results (it is the same logic as dividing by zero or
accessing memory through an invalid pointer).
0 or 1: silently give wrong results.
I'm afraid the linked IRC discussion has disappeared from the web and
is not on archive.org - in any case, mailing lists are the place to
hold open source discussions, both so that it is archived and to avoid
"select inner group" false consensus among the few people who happen
to be awake and hanging out on IRC at the time.