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\[SNIP\]
Let's start bikeshedding. What are your ideas about names and the order
of arguments of two following functions?

1\. Takes a slice object, returns it's start, stop and step as Py\_ssize\_t
values. Can fail.

2\. Takes slice's start, stop, step, and the length of the sequence (all
are Py\_ssize\_t), returns adjusted start, stop, and the length of sliced
subsequence (as Py\_ssize\_t). Always success.