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Verified for 2.4 and head.  The probably could exist w/ucs2
also if you use 'bar' (I think).

I agree with Nick, this patch doesn't really solve the
problem.  The attached patch fixes the crash more generally,
but I'm think there is a better solution.  I hope Martin has
time to review this and suggest a better fix.

Martin, the change in getargs ensures that we don't try to
convert an 8-bit string of length 5 to unicode.  The change
in unicodeobject ensures that we don't reference the array
with a negative offset as happens if the buffer conversion
succeeds with an invalid unicode character.