Fun days:
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I just know if I remove the OAuth version info from this login path someone will announce a 3.0 spec tomorrow.
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Replying to @Nick_Craver
don't worry, there is no 3.0

Dec 11, 2018 · 5:55 PM UTC

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Replying to @aaronpk
I don't really think there was a coherent 2.0 ;)
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very true, which is why I had to write a book on it ;-)