patch 8.2.2065: using map() and filter() on a range() is inefficient Commit: https://github.com/vim/vim/commit/f8ca03bf9161ab9ee1a29db1d13c02b317c10029 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Nov 28 20:32:29 2020 +0100 patch 8.2.2065: using map() and filter() on a range() is inefficient Problem: Using map() and filter() on a range() is inefficient. Solution: Do not materialize the range. (closes https://github.com/vim/vim/issues/7388)