[mindslight]

Erm, receptacles are a type of outlet.

AFAIK the code also requires the wiring itself in those places be AFCI protected, since the (immediate) goal was to avoid smoldering fires in the wall where people sleep. This would imply the simplest route is an AFCI breaker for the whole branch circuit, although it was (is?) permissible to run metal conduit up to the first receptacle and have that do the AFCI.

Would have loved for the NEC to require that the code on AFCIs was technician-upgradeable and some general sense of open, but I'll just go back to banging my head against the wall now.