ridding ! expansion in *shell*

[Dan Jacobson]

I thought I had turned off that ! stuff once and for all [*shell* buffer]:

$ set -o|grep histexpand
histexpand      off
$ echo sed !d
sed !d
$ echo sed date

however upon M-p, "date" pops in.

I do C-h m, learn about comint-input-autoexpand seeing that being that
comint-input-autoexpand's value is nil it shouldn't do this according
to *Help*, as only if its value is "history" should it do this, but
it does this anyway.
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