in reply to
Re^2: Four annoying warnings
in thread Four annoying warnings
But with strict that already doesn't compile. When you use strict, "once" usually becomes pretty irrelevant.
Mostly yes, but not if you refer to a fully qualified varable from another package. For example, when I am debugging my code, I often put DB::single=1 at various places. Sometime I leave those line in production code inside assert like error checks, as a kind of assert that will only go off when debugging.
I have found that those lines will trigger the "once" warning, which is irritating.