[alankay1]

Nothing is technically stored with the class object (everything is made from objects related by object-references). Semantically everything is "together". Pragmatically, things are where they need to be for particular implementations. In the early versions of Smalltalk on small machines it was convenient to cache the code in a separate file (but also every object -- e.g. in Smalltalk-76) was automatically swappable to the disk -- just another part of the pragmatics of making a very comprehensive system run on a tiny piece of hardware.