Created attachment 174088 [details] [review]
patch and test cases

If a class adds a property with

    properties => [ { pspec=>, get=>, set=> } ]

then those get/set funcs are not called from a further subclass of that class.

I think the lookup for those get/set funcs should be on the pspec->owner_type, not the instance type.  The instance type is the subclass, whereas the owner type is one which defined the property and where the get/set are stored -- per attachment.