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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'
 >>> print(repr(s[-5:5]))
 >>> print(repr(s[5:15]))

why is the underflow start index treated so differently from the limit index overflow? I suppose there must be some reason, but it 
eludes me.
Robin Becker