[issue5883] detach() implementation

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The various structures now contain several 'boolean' flags. It would 
improve memory usage to use bitfields. Or would this impact performance 
?

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue5883>
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