Handling of 'git-config foo=bar'

Currently, running "git-config foo=bar", ie. presumably an erroneous
attempt at setting "foo", indeed queries "foo=bar", so outputs nothing
and reports success.

Do we want to allow "=" signs in config var names ?  It would seem
reasonable to refuse them, and report an error to the innocent user
(OK, i'm not that innocent, but still ;)

Or does that sound a bad idea to anyone ?

Best regards,
-- 
Yann.