[material-ui][theme] Array syntax doesn't work for values in styleOverrides in theme about material-ui HOT 4 OPEN

Where in the Material UI v4 documentation does it mention support for the array syntax?

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I'm not sure that the v4 docs specifically call out support for the array syntax, but they say the styling system is built in JSS, and the JSS docs talk about it. So far I have been using it in my v4 project's theme with no issues.

Meanwhile the v5 docs say that migrating from JSS to Emotion is optional, and the section on theme updates in the v5 docs doesn't mention support was dropped.

This section does mention that support for the $ local rule reference syntax won't work. Perhaps around there would be a good place to mention the array syntax as well.

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@cjl750 Okay alright, thanks for the details. Since this issue wasn't previously brought up by users, we hadn't considered it before. Adding a mention about it in the section you pointed out seems like a good idea. Would you like to create a PR for it?

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Would you like to create a PR for it?

Sure, I can take a shot at that later this week sometime, if that works.

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