Optional.or() doesn't use a wildcard in its signature

[Michael Nascimento]

If this instance is an Optional<CharSequence> ,  passing an
Optional<StringBuilder> will fail to compile.

Regards,
Michael
On 31 Oct 2015 11:21, "Stefan Zobel" <spliterator at gmail.com> wrote:

> 2015-10-31 19:11 GMT+01:00 Remi Forax <forax at univ-mlv.fr>:
>
> > Hi all, hi Paul,
> >
> > I've just seen that Optional.or is declared as
> >   public Optional<T> or(Supplier<Optional<T>> supplier) {
> > instead of
> >   public Optional<T> or(Supplier<? extends Optional<T>> supplier) {
> >
> > regards,
> > Rémi
> >
>
>
> I don't get it. Optional is final anyway. Can you explain?
>
> Thanks,
> Stefan
>