This API is there since about a decade.
well. I do not think that this is that long.
In Smalltalk the selector would have been allSubclasses. However, in Moose, we typically use all for contained elements.
what do you mean?
This is why it's not called allSubclasses. Another possibility would be to call it deepSubclasses. But, of course, everything is subject to change.
I do not understand why you choose something that goes against our cultural reference.
to me allSubclasses is simple, intention revealing and it works well.
I started to create my own extensions because I do not have the brain cells to remember that sublcassHierarhcy which refers to a "bag" returns