Saving and restoring state after a crash is difficult, because often times it is the fault of incorrect state that your genserver crashed in the first place. If you automatically save invalid state and then load it again when your process restarts, you’ve just created an endless loop of crashes. So supervisors will restart their processes with “known good” state. Since the only state that we can guarantee with 100% certainty is “good” is the initial state (because if it wasn’t then the process would crash on init and you’d see it), that’s the default state to give to a newly restarted process.
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