[swift-evolution] Proposal: Python's indexing and slicing

[Amir Michail]

Examples:

>>> l=[1,2,3,4,5]
>>> l[-1]
5
>>> l[-2]
4
>>> l[2:4]
[3, 4]
>>> l[2:]
[3, 4, 5]
>>> l[-2:]
[4, 5]
>>> l[:3]
[1, 2, 3]
>>> l[::2]
[1, 3, 5]
>>> l[::]
[1, 2, 3, 4, 5]

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