how should it work?

[Daniel L. Weinreb <dlw at SCRC-TENEX>]

Consistency both states that Abort should be inserted AND that Abort
should quit.  My conclusion is that there is no way to be consistent.
Since consistency is out as a criterion, I guess that since it's easy to
cancel a c-Q by just doing it and rubbing out the result, (or, in the
present implementation, by typing, say, "Q" or "A" or some other unused
non-shifted letter!), it should insert an Abort.  Break should insert
a Break, too, in any case.