Daniel Stutzbach <stutzb...@google.com> added the comment:

Would it be sufficient to:

1) Restrict collections.Set()'s operators to accept collection.Set but not 
arbitrary iterables, and
2) Fix Issue2226 and let set() | MySimpleSet() work via collections.Set.__ror__

Attached is a patch that implements this approach, nominally fixing both this 
and Issue2226.

This solutions seems much too simple in light of how long I've been thinking 
about these bugs.  I suspect there are code hobgoblins waiting to ambush me. ;)

----------
Added file: http://bugs.python.org/file20045/set-with-Set.patch

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<http://bugs.python.org/issue8743>
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