[issue4707] round() shows undocumented behaviour

[Raymond Hettinger]

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

IMO, having long.__round__ return a float is a landmine, guaranteed to
cause someone problems someday (problems that are hard to find).

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priority: critical -> release blocker

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4707>
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