[issue2723] Truncate __len__() at sys.maxsize

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Well apparently the Java guys think raising an exception would have been
a much better idea than the behaviour they are stuck with.
There's also in interesting proposal there:

""" The ReturnValueTooBigException could even have a method declared as
"long size()" that reports the actual size of the collection. """

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