For Jupyter, q() should probably be overridden to error and tell you how to actually shut down the right way

[DavisVaughan]

Otherwise R just dies and Jupyter throws warnings that R isn't responding to is_complete_request and friends

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We could probably send the ask_exit payload from the kernel -> frontend, telling the frontend to request a shutdown?
https://jupyter-client.readthedocs.io/en/stable/messaging.html#payloads-deprecated

Payloads are deprecated but there is currently no alternative, so I feel like we should just use it for now (its been deprecated for over 9 years...)

It looks like you send it as part of an execute_reply
https://github.com/jupyter/jupyter_console/blob/fddbc42d2e0be85feace1fe783a05e2b569fceae/jupyter_console/ptshell.py#L743-L767

[DavisVaughan]

Oh ask_exit is also how ipython implements the exit and quit commands! i.e. when you type that directly at the console it:

• fires this exiter https://github.com/ipython/ipython/blob/9b52ad5d0fae168679a63ecc8743541e2f127d92/IPython/core/interactiveshell.py#L1389
• which is this ExitAutoCall https://github.com/ipython/ipython/blob/9b52ad5d0fae168679a63ecc8743541e2f127d92/IPython/core/autocall.py#L51-L57
• which is an ask_exit() reply

So yea I doubt there is any way this would get removed and is probably safe to use