[Zope] CMF Folder Types was InvokeFactory Question

[robert]

I makes me wonder how a Portal Folder can be made inside a plain Folder 
in the ZMI and not throw an exception, yet to do it programatically 
facilitates an unpredictable behavior.  Perhaps a TypeError exception 
should have been raised in both circumstances when there was an attempt 
to place a Portal Folder type inside a plain Folder.  Are there 
circumstances that you can think of where you would want Portal Folders 
to be allowed inside plain Folders in CMF.  Is this a bug?

this is the wonder of acquisition

Robert