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Cool idea.

> time $* && fin || die

I don't know zsh, but this doesn't look escaped properly to me? Bash has so many footguns.

What does the bloom filter do? Is it sort of like a hash to try to make each process show up on a different LED on the display?

Also bonus feature is the LEDs that light up for the same command in the same directory are also the same LEDs.

That means I can tell exactly which processes are in which status.

Yes, that's exactly what it does!