Bug in email package?

[Roman Suzi]

I was playing with email package and discovrered this strange kind of 
behaviour:

import email.Message
m = email.Message.Message()
m['a'] = '123'
print m
From nobody Mon Feb 21 00:12:27 2005
a: 123

for i in m: print i
...
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/local/lib/python2.3/email/Message.py", line 304, in __getitem__
    return self.get(name)
  File "/usr/local/lib/python2.3/email/Message.py", line 370, in get
    name = name.lower()
AttributeError: 'int' object has no attribute 'lower'
I think that if any object (from standard library at least) doesn't support
iteration, it should clearly state so.
My guess is that 'for' causes the use of 'm[0]', which is (rightfully) an 
error...

Can this behaviour of email be considered a bug?
Is there a good case to iterate over something useful in a message?
P.S. rfc822 has the same behaviour, at least on Python 2.3
Sincerely yours, Roman Suzi
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