Hi.
Look at UndefinedObject instance side methods. You will see class hierarchy
protocol. For example nil understands #subclasses message:
nil subclasses "==> {ProtoObject}"
It implemented like this:
UndefinedObject >>subclassesDo: aBlock
"Evaluate aBlock with all subclasses of nil. Others are not direct
subclasses of Class."
^ Class subclassesDo: [:cl |
cl isMeta ifTrue: [aBlock value: cl soleInstance]].
So my question is: why it needs to be like that? And does it really needed?
I removed all this methods and not saw any problem.
