Avoid return and callArg* clearing each other's state #2593
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Purpose (TL;DR) - mandatory
This partially reverts changes done in #2567, as the clearing of state was a bit too invasive. It is fully possible to have functions that both call callbacks and return values, which was made impossible by this change.
I kept the tests, which proves this fix is not affecting the intent of the original fix, and additionally added a regression test for #2572 to make sure it keeps that way.
How to verify - mandatory
npm install
Checklist for author
npm run lint
passes