rufuspollock
commented
7 years ago @Mottie seem reasonable suggestions. Would you be able to provide a pull request for the changes you are suggesting with a good descriptive commit message setting out the reasons for the change 😉
PS: diacritics looks like a cool project 😄
The link in the readme to the IETF registry isn't very helpful. I would like to suggest changing it to point to either the W3C languages tags page, or to RFC 5646 which is linked to from the W3C page.
Personally, I think the W3C link would be better since it should get updated with new releases. Whereas it is difficult to determine if and when rfc5646 becomes obsolete from the provided link.