[Python-Dev] PEP 443 - Single-dispatch generic functions

[Ben Hoyt]

> So I am a strong +1 on allowing multiple types to be registered in one call.

Yeah, agreed. It also fits the pattern set by isinstance(), which
allows a tuple of types, like isinstance(x, (int, str)).

That said, I'm +0 on this PEP itself. It seems no one has provided
decent use-case examples (apart from contrived ones), from the stdlib
for example. In the fairly large codebase I work on, it'd only be used
in one place, and even there the PEP's approach is arguably too simple
for what we're doing. It seems to me for the few times this would be
used, direct and simple use of isinstance() would be clearer. But
maybe that's just our particular codebase.

-Ben