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Here's a preliminary implementation of the PEP,
including unittests checking the promises made in the
PEP (test_bool.py) and (some) documentation.
With this 12 tests fail for me (on Linux); I'll look
into these later. They appear shallow (mostly doctests
dying on True or False where 1 or 0 was expected).
Note: the presence of this patch does not mean that the
PEP is accepted -- it just means that a sample
implementation exists in case someone wants to explore
the effects of the PEP on their code.

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Here's an updated diff (booldiff2.txt). It fixes a refcount
bug in bool_repr(), and works with current CVS.
With this patch set, 10 standard tests fail for shallow
reasons having to do with str() or repr() returning False or
True instead of 0 or 1. Here are the failed tests:
 test_descr test_descrtut test_difflib test_doctest
test_extcall
 test_generators test_gettext test_richcmp
test_richcompare
 test_unicode

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This patch does not support pickling of bools (the PEP
should probably spell out how they are pickled). marshalling
of bools does not round-trip (you get back an int).

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I've attached a new patch, booldiff3.txt, that solves the
two remaining problems:
- picke, cPickle and marshal roundtrip
- the test suite succeeds (a total of 12 tests had to be
fixed, all because of True/False vs. 1/0 in printed output)
I'm ready to check this in, but I'll first update the PEP.

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Here's a new version of booldiff.txt that includes the new
files boolobject.[ch] and test_bool.py. Sorry.