Comment 1 for bug 143344

Googling shows that Toby added the ZODB+ZEO code for getExtensionMethods late 2002. AFAICT, he didn't check in docs or tests for it, just implementation code.

Since I don't know anything about it, and Zope Corp doesn't appear to make use of it, it's hard for me to justify spending work time it.

Best guess is that the problem is shallow, but likely shallower to Toby than to anyone else on the planet.