Top and Bottom Values [PEP: 326]

[Lawrence D'Oliveiro]

In message <slrnehk7ju.rcu.apardon at rcpc42.vub.ac.be>, Antoon Pardon wrote:

> I need this Top value in
> a context where it can be used as a start or stop value
> in a slice.

But the only valid values allowed for indices are 0 up to the length of the
array inclusive. Larger integers are not allowed, so why should Top be
allowed?