[issue4591] 32-bits unsigned user/group identifier

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I'm not sure hardcoding "2^32 - 1" in the error message is a good idea.

I also think it would be nice to have tests for the "-1" special value:
- check that chown(-1, current_gid) succeeds (and leaves the uid intact)
- check that chown(current_uid, -1) succeeds (and leaves the gid intact)

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versions:  -Python 2.5

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<http://bugs.python.org/issue4591>
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