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Hmm, I'm now older and more cowardly than when I wrote this,
and I have a couple of questions.

This patch changes the behaviour of PySlice_GetIndices,
which must count as a public API function (albeit a pretty
useless one as it is now).  Is that OK?  Or would it be
better to have a new function PySlice_GetIndicesEx or
something.  Should check whether NumPy uses this function.

Do you really want assignments to extended slices in lists?
 They were never that inuitive to me.