Is my assessment in the last paragraph of my original post correct? I purposefully intended to use a before modifier as opposed to an entire new BUILD method. My hope was the before modifier would be applied to the parent BUILD method since the child did not have a BUILD method. I didn't realize I would end up running both parent and child BUILDs independently.

I do find it odd that in my reply above with the around BUILDARGS modifier, the Foo::BUILD method is only executed once. I would have expected the child to inherit the BUILD method and execute it also (thus required an empty BUILD method in the child if I wanted no further action taken at that time).

Why does the child seem to inherit (and run) Foo::BUILD when I give a before BUILD modifier in it, but not inherit (or run) BUILD when I do not provide a modifier on the method?