Add a way to avoid magically passing props to inputs

[danielweinmann]

Today, all inputs, selects, text areas, etc. that match child.type === Input (or Multiline, or Select, etc) will receive a bunch of props.

The problem is that React's type comparison is very loose. So, if your component is roughly the same type, it will receive the props. For instance, if you run the array of strings example without customizing the form's inputComponent to something other than input, it will pass unnecessary props to the tags input and mess up the behavior (thanks Chi on Discord for providing the example :D).

I don't have any solid idea of how to address this. Maybe we could check the child's props and see if there are any clues that this is a custom component (value, defaultValue, name, etc.), and if that's the case, we don't do our magic. But this doesn't feel much better than the current behavior to me.

I'd appreciate suggestions :)

cc @diogob @gustavoguichard