Eli Zaretskii <eliz@gnu.org> writes:

>> I understand. However, the problem is quite unexpected. I do not see how
>> application can anticipate it. Probably, adding a note to docstring
>> would be useful? Something like in the attached patch.
>
> Fine with me, thanks.

The patch here was never installed.  Should it be?

I've attached a version below with some minor touch-ups.