Naive question on [min, max] or [min, max)

Hi.

I have a naive question on min, max of class String in validators.py
==
def validate_python(self, value, state):
        if (self.max is not None and value is not None
            and len(value) > self.max):
            raise Invalid(self.message('tooLong', state,
                                       max=self.max),
                          value, state)
==
why not  len(value) >= self.max ?

Python build-in range(start, stop, step), does not have stop in the
resulting range.
i.e. range(1. 3) => [1, 2]

I know it may be hard to change now due to impacts to users.
I felt it bit strange, so  I want to know thoughts behind it.
--
Nori

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