Warn about non-string values passed to enhance

Multiple users have asked for help (warnings etc.) when passing strings to enhance for rendering.
The two common requests are help when forgetting to join arrays, and passing strings as attributes that need to be quoted.

[enhance discord thread](https://discord.com/channels/1012099764713705472/1203082774572179597/1203085963983593522
)
> Benanna19 OP — Today at 4:14 PM
> Two things that I think would make quality of life easier for me, so maybe a bit selfish haha, is having some type of linting to:
>
> 1) remind me to use the .join("\n") on lists
> 2) scream at me when I don't pass values correctly.
>
> I'm sure if I could get to a place of spending more time with enhance than with other tools this wouldn't be a problem. I can dream haha