Class/forName considered as function name (proposal: say that it must be a simple symbol) about clj-kondo HOT 8 OPEN

That was a typo. Writing extend is simple.

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I think we could improve the error message to say that the class name must be a simple symbol

from clj-kondo.

You can't officially use (Class/forName "[B") with extend-protocol.
Only class names are allowed, not expressions. That it works is accidental. In this case it's better to write the extend call manually. I can give links where this is discussed later on. One of the issues with doing what you do above is that it becomes unreliable when you have multiple expressions like that.

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I see, did not know that!

better to write the extend call or simply (?)

I'd like to know what "simply" is here cause I like simple :)

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In Clojure 1.12 you will be able to write (extend-protocol IFoo byte* ...)

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Here is the relevant JIRA: https://clojure.atlassian.net/browse/CLJ-1381
Slack discussion: https://clojurians.slack.com/archives/CHY97NXE2/p1677266201633939

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Also see https://clojure.atlassian.net/browse/CLJ-2836

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I'll leave this issue open until CLJ-2836 is resolved.

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