Łukasz Langa <luk...@langa.pl> added the comment:

Patch updated:

 * uses collections because they are built into the executable for 3.2
 * uses itertools for the same reasons
 * in the end doesn't use weakrefs since after recent commits (Raymond removed 
__del__ from OrderedDict) the reference cycle problem went away on its own

Still needs docs but I didn't manage to make sensible edits last night (the 
train I took from Hannover arrived 80 minutes later).

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Added file: http://bugs.python.org/file19010/issue5412.diff

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