Has anyone tried adding syntax highlighting to GitHub for Caché CLS files?
Looking at the list of supported languages and extensions...
https://github.com/github/linguist/blob/master/lib/linguist/languages.yml
It looks like Mumps is supported, and there is also an existing language with a .cls extension, which would account for why I see some very odd highlighting going on with some of my code.
There is a page on contributing a new language here...