[Python-3000] Fix imghdr module for bytes

[Greg Ewing]

Joel Bender wrote:

> Would you propose these to be mutable as well?

No, they'd be integers.

-- 
Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	   | Carpe post meridiem!          	  |
Christchurch, New Zealand	   | (I'm not a morning person.)          |
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