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You are right. It wasn't client side routing.

But GitHub doesn't use turbolink. They wrote their own implementations that lies at app/assets/modules/github/behaviors/pjax.ts.

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Ah, AFAIK that's not actually theirs but: https://github.com/defunkt/jquery-pjax (although I guess they rewrote it in TS, unless that's a different project floating around?), from which Turbolinks took its inspiration as a Rails-native built in solution. Presumably GitHub never saw any reason to rewrite for Turbolinks when the latter appeared.

> AFAIK that's not actually theirs but: https://github.com/defunkt/jquery-pjax

Check out https://api.github.com/users/defunkt:

> "id": 2

pjax was written by a GitHub founder for use in github.com.

huh, TIL

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