I want to bind opening a repl to <c-ret> but it doesn’t work. I suspect suspect it’s similar in root as <c-/> problem. However, I can’t find the right entrypoint to solve this. Please can somebody point me into the right direction? (me asking for the way again 
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I don’t think <c-ret> is bindable, see also Ambiguous Keys.
You can find out the name of a key sequence by running :on-key 'echo %val{key}'.
Control+Return is read as <ret>, probably for historical reasons.
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