Why are Arrays used to Set Variables in Sanity UI?

Sanity UI—what's up with the arrays to set some variables? Is it for breakpoints? e.g.

padding={[3, 3, 4]}

You're exactly right: it's for breakpoints. I'm not sure if it's documented yet (I'll take a look a bit later) but if you check the Arcade you can see them in action.

Perfect. Thanks—I did a little test myself and confirmed 🙂
Doesn't look like it's documented yet as far as I can tell. Getting Started just has an example of setting a single number for padding. No mention I could find on what the breakpoints are—ordering, browser sizes, etc.