Comment by omoikane

This scheme skips over 80 through 9F because they claim it's never appropriate to send those control characters through interchangeable text, but it just seems like a very brave proposal to intentionally have codepoints that can't be encoded.

I think the offset scheme should only be used to fix overlength encodings, and not trying to patch over an adhoc hole at the same time. It seems safer to make it possible to encode all codepoints whether those codepoints should be used or not. Unicode already has holes in various ranges anyways.