This introduces a new 'toggle' controller, and we already had three\! So I created a generic interface that could be extended to potentially support all of them. I propose we try to reduce them all into the one controller, but won't go down the rabbit-hole just yet..
I have an idea on how to re-arrange and make it more contained, by assigning the controller only to the checkbox, and defining targets with aria-controls="", but chose to stick with Stimulus conventions for now.
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