[racket] implementing OAuth 1.0 protocol?

I have a student (cc:ed) that noticed that there's an OAuth 2.0 library for Racket, but no OAuth 1.0 library. Apparently, there are some differences, so that you can't use OAuth 2.0 to implement (say) an interaction with Twitter. Can anyone with OAuth experience confirm this, and also the absence of an OAuth 1.0 library for Racket?

Many thanks,

John
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