But the Rust version of the blank check doesn&#x27;t handle any encoding but UTF-8. Helix could wrap up a char iterator for it I suppose, one that calls rb_enc_codepoint_len?<p>And isn&#x27;t there some common C lib that exposes Unicode functions like is_whitespace? Granted, using a cargo crate is easier than finding and adding a .h, and far easier than getting and linking another lib.