[issue2723] Truncate __len__() at sys.maxsize

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

Agreed, having it lie about the size is the WORST possible behavior
because it will silently hide problems.  Lets not do that.

But I must've missed something, why can't __len__ return the correct
value?  Merely because range() is broken and might use it as input? 
Thats no excuse.  Fix range().

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nosy: +gregory.p.smith

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