@jasons-novaleaf I think `prop(...)` function must be `any` type and not `string`.

Example:

> If you have the following html checkbox:

	<input id="cb" type="checkbox" checked="checked" />
	
> the following code returns a boolean value:

	$('#cb').prop('checked')

> ref: http://api.jquery.com/prop/

What do you think about it?