bug#33998: 27.0.50; cl-delete does not delete the first list element

[Drew Adams]

> > > So, cumbersome as it is, you should always use:
> >                                ^^^^^^^^^^^^^
> > > (setq seq (cl-delete thing seq))
> >
> > FWIW, this is not really true.
> >
> > `cl-delete' deletes THING from the
> > _value_ of SEQ.  You might or you
> > might not want variable SEQ to have
> > the updated value.
> 
> But this is what he wanted, so what's
> the point in making this more confusing
> than it needs to be?

It's enough to suggest that he might want
to do that, and point to the manual for
explanation.  It's the "always" that's
misleading.