I co-maintain GNU coreutils and wrote the Neon 'wc -l' code, for reference. Based on my quick look at the source code, it looks like this program can handle AS

I co-maintain GNU coreutils and wrote the Neon 'wc -l' code, for reference. Based on my quick look at the source code, it looks like this program can handle ASCII whitespace. GNU coreutils uses iswspace, which is locale-aware. That limits how much we can optimize. We could probably add more optimization if the current locale is ASCII, e.g., LC_ALL=C on GNU/Linux.