[racket] How to handle exit of a GRacket application?

Hi there,

My Racket GUI application needs to do a lot of cleanup work when exiting,
i.e. when the user presses the X button. Wrapping the .rkt in a shell
script which waits and then does the cleanup is a bit too hacky for me.
There are many exit handlers in the Racket documentation (exit-handler etc)
but none of them seem to work!

Thanks a whole ton!

Yuhao Dong
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