Allowing zero-dimensional subscripts

[Fredrik Lundh]

Carl Banks wrote:

> How would you index a 2-D array?  With a 2-tuple.
> How would you index a 1-D array?  With a 1-tuple.
> How would you index a 0-D array?  ...

array dimensions don't exist at the Python level.  you're confusing 
behaviour that a custom class may provide with Python's view of things.

(and None is of course the standard value for "not there")

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