[3.11] gh-118476: Fix corner cases in islice() rough equivalent. (Gh-118559)#118588

miss-islington wants to merge 1 commit intopython:3.11python/cpython:3.11from

miss-islington:backport-c7c9b91-3.11miss-islington/cpython:backport-c7c9b91-3.11Copy head branch name to clipboard