Difficult to understand what the point of this is - it seems like a feature added to get around developer error.
I didn't find the cupcake example explained the rationale.
Considering the portal alias junk I have accumulated:
3 0 67.199.59.209 -1 11/19/2010 12:29:53 AM -1 11/19/2010 12:29:53 AM
7 0 allrequestsallowed.com -1 12/6/2010 8:12:53 AM -1 12/6/2010 8:12:53 AM
15 0 ya.ru -1 3/20/2011 7:37:19 PM -1 3/20/2011 7:37:19 PM
17 0
www.sun.com -1 4/12/2011 7:05:25 AM -1 4/12/2011 7:05:25 AM
18 0 kivalov.info -1 4/27/2011 11:58:06 PM -1 4/27/2011 11:58:06 PM
How did these sites end up being registered as aliases?
This looks like a potential source of problems.
I can perhaps see this facility as being an OPTION, but a default? Daft.
JC