Looking at issue 32288, I realised that the glossary doesn't define "extended slicing" or "extended slice", even though they are common terms. Although I thought I know what they meant, on closer reflection I realised I wasn't sure.

Does extended slicing refer to slice *objects* with a stride/step, as opposed to slice objects all the way back in Python 1.3 (yes, *one* point 3) that only had start and end?

Does it refer specifically to the two-colon form of slice *syntax*?

Both? Neither?

https://docs.python.org/3/glossary.html#term-slice

The only documentation I found is from the 2.3 What's New:

https://docs.python.org/2.3/whatsnew/section-slices.html