FEATURE: add --unique flag to append #5
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… to only actually append the item to the array if the value does not yet exist in the array.
I had a go at #4. Is this OK? Wrote a unit test for it and cleaned up some clippy suggestions.
One shortcoming: maybe it should possibly throw an error instead if the item is not unique so the user can decide what to do?
Ran
just testandjust cito test/lint.