`*' interactive spec in some text-killing functions

[Juanma Barranquero]

The following functions from simple.el do not have the `*' interactive
spec: zap-to-char, kill-line, kill-whole-line, kill-word,
backward-kill-word. (They don't have a call to
`barf-if-buffer-read-only', either).

Using any of them in a read-only buffer does not delete text, but it
moves the point forward (or backward, in the case of
`backward-kill-word'), which is weird.

Is that intended, or should they have `*' in the interactive spec?

Additionally, `overwrite-mode' and `binary-overwrite-mode' do not have
`*' either. It is customary not to do so for minor modes, it is an
oversight, or it is really preferred not to get an error message in
interactive uses of the overwrite modes?

            Juanma