R. David Murray <rdmur...@bitdance.com> added the comment:

Actually, it is documented: 
http://docs.python.org/dev/reference/datamodel.html#basic-customization

"__new__() is intended mainly to allow subclasses of immutable types (like int, 
str, or tuple) to customize instance creation."

It could certainly be better documented, but where?  The tutorial?

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nosy: +r.david.murray

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