To me this comes off as assuming the worst intentions on behalf of the github developers.
No, the primary_extension is only used in a gists_helper.rb file outside the Linguist repos. Note that the feature is deprecated anyway.
https://github.com/github/linguist/blob/master/lib/linguist/...
Luckily I use languages popular enough to be classified correctly.
> Basically, Github needs to be accepting of programmers of all stripes, or they are destined to be irrelevant (or at least doing lots of scrambling) once the trendy kids move on from the trendy things they're doing and the currently-popular languages start falling out of style with a reversion to a previous status quo. Github needs to accept that there is a vast wealth of code out there which predates it and which will easily postdate it.
Okay there, buddy. I don't think lack of Lingo support is going to be GitHub's eventual downfall.