KeyedCollection in VW 9.3.1

Hi,

I was just debugging a weird problem with a method "foo" defined in 
KeyedCollection class>>foo that overrides a method in Collection 
class>>foo. However, if I send #foo to a subclass of KeyedCollection, e.g., 
SequencableCollection, the implementation from KeyedCollection class is 
never called but always the one from Collection class. However, the browser 
clearly indicates that the method is indeed overridden.

After inspecting the metaclasses, I found that KeyedCollection is skipped, 
e.g. SequenceableCollection class inherits directly from Collection 
instead. All this is in a clean 9.3.1 (pul) image. Am I lost in metaclasses 
or is something not quiet right here?

Best, Steffen