S4 method inheritance

....

Finally, I'm a bit concerned that one article mentioned that S4
inheritance, in practice, is used mostly for data, not methods (Thomas
Lumley, R News 4(1), June 2004: p. 36).  Am I going down a road I
shouldn't travel?

Hmm, maybe I just found out.  If B is an S4 subclass of A (aka extends
A), how does B's method foo invoke A's foo?

The question assumes that A's foo was defined as an in place function,
so there's no (obvious) named object for it, i.e,
setMethod("A", signature(blah="numeric"), function(x) something)