— That func is used to test the other diff func 😛
— Not cyclic reference proof though, the other one is
— It's more simple of an algorithm with no external state
— So it's good to use to test the more complex one
— It shouldn't be very hard to add cyclic support
— I'd just compare if this prop's value is the original object and not recurse down after comparing it.
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— Need to remember what's been seen before