Field requires String, check for Array

[TomDeSmet]

I'm adding data to a Jason field via AJAX by posting to a controller in another plugin. I noticed Jason Field expects a String as it does a JSON.decode() by default.

Maybe this could be altered and have an extra check for the Array type?
If I pass a JavaScript object in my fetch data like this: fields[jasonFieldHandle] the JasonField gets its data as an Array.
Now I need to have an extra JSON.stringify() in my JS code, which is not terrible, but it is weird from a developer point of view that I cannot pass valid JSON to a JSON field :)