curious asymmetry in range limiting
I don't know how I never came across this before, but there's a curious asymmetry in the way ranges are limited
Python 3.6.0 (v3.6.0:41df79263a11, Dec 23 2016, 08:06:12) [MSC v.1900 64 bit (AMD64)] on win32
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>>> s = '0123456789'
why is the underflow start index treated so differently from the limit index overflow? I suppose there must be some reason, but it