Some assertions left in production mode

[AlexGalays]

A few assertions are left in the production output (using webpack -p if that matters) as they're not located inside an if(env) block; Could squeeze a few bytes!

Examples:

"You provided a `checked` prop to a form field without an `onChange` handler. This will render a read-only field. If the field should be mutable use `defaultChecked`. Otherwise, set either `onChange` or `readOnly`.

dangerouslySetInnerHTML` must be set using `updateInnerHTMLByID()`.",style:"`style` must be set using `updateStylesByID()`.

You provided a `value` prop to a form field without an `onChange` handler. This will render a read-only field. If the field should be mutable use `defaultValue`. Otherwise, set either `onChange` or `readOnly`."

[jimfb]

The second message was fixed in #5205

The first and third will probably be cleaned up as part of #2302, but I suppose we can keep this issue open until that happens.

[aweary]

None of these assertions exist in the latest 15 or 16 RC release 🎉