[issue2778] set_swap_bodies is unsafe

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Sorry, you don't like the search with autopromotion feature. It has 
been around since sets were first coded in C.  It is a natural 
extension/consequence of the idea that frozenset('abc')==set('abc').

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<http://bugs.python.org/issue2778>
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