adds simple warning when falling back to jsonstring

[DGollings]

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Leave anything that you believe does not apply unchecked.

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[zachdaniel]

I like this, I do worry a bit about an undismissable warning that isn't necessarily a problem though 🤔 Although it's dismissible by defining a new type. Let me think on it for a bit.

[jsw800]

I really like this, I've accidentally exposed types like this before only for my front end peeps to come asking why this type is janky 😂 but agree about the undismissable thing. I do have one or two types in my own system that I deliberately expose as JsonString. If this could be setup so there's a way to dismiss the warning in that case, that'd be great. I don't know this code well enough to tell if that's currently the case or not

[zachdaniel]

🚀 Thank you for your contribution! 🚀