well you did

> mention there's a recent ticket

created by you

> Also found a ticket in the queue of List::MoreUtils, but the author claims the functionality already exists in List::Util ?!

He's the maintainer, I think the authors abandoned it. And he most likely misunderstood the question.

I already contacted him privately regarding the scalar behavior of slide, his answer was kind of indicating that he would pass on the maintainership if asked.