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grp.listen init, value
I've found that grp.listen() when when it has last optional param set to true, then it initially runs 2 times: 1) state=="init", 2) state=="value"

I think state=="value" should only run when value change or update on a bus, this is logically separated from "init".
Done is better than perfect
This is intended behavior. You can ignore init state and/or use a variable to check if this is the first time that callback is called.

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