HostName not quite working as expected?

[Jay Levitt]

Setting up a few hosts in a small domain, I thought I'd save keystrokes 
by defining ssh_config aliases for their
non-canonicalized names.  For example:

Host myhost
  HostName myhost.example.com

Host *.example.com
  Port 23
  ...

I would have expected that "ssh myhost" would then start a session on 
port 23 (instead of 22).  And I've seen blog/list posts that suggest the 
same (which, of course, I can't find now), as a workaround for "Host" 
entries not canonicalizing via DNS.

But that's not what happens.  "ssh myhost" correctly connects to 
myhost.example.com, but doesn't pick up any of the *.example.com host 
configuration.  Likewise adding:

Host myhost.example.com
  Port 23

it still connects on port 22.

Is this the intended behavior?  It seems like a bug to me, but it's 
still present in the 20080829 5.1 snapshot, and nobody's ever mentioned 
it before.  Maybe it's just something that could be documented better?

Jay Levitt