[issue8603] Create a bytes version of os.environ and getenvb()

[Martin v. Löwis]

Martin v. Löwis <martin at v.loewis.de> added the comment:

>> I notice an incompatible change: posix.environ has now a
>> different element type. This is probably fine.
> 
> I don't understand, what is an "element type"?

In a container, the contents is sometimes called "elements"; their
type is the element type. Currently, keys and values are strings;
with the change, they are bytes.

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<http://bugs.python.org/issue8603>
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