You should try something like (Object withAllSubclasses reject: #isMeta) size...

Also maybe start with ProtoObject...

In Squeak, I have
((Smalltalk allClassesAndTraits reject: #isTrait) difference: (ProtoObject withAllSubclasses reject: #isMeta)) size = 0

2015-05-21 22:14 GMT+02:00 Esteban Lorenzano <estebanlm@gmail.com>:

Smalltalk allClassesAndTraits size. "5057"
Object withAllSubclasses size. ��9900"

I really do not understand :)

Esteban