Passing a number to a component

I am trying to pass a number to a React component but it is getting parsed as string (jsfiddle). How do I make React understand that I am passing a number? Should I cast the string to a number in the component?

var Rectangle = React.createClass({
   
    render: function() {

        return <div>
            <div>{this.props.intValue + 10}</div>
            <div>{this.props.stringValue + 10}</div>
        </div>;
    }
});
 
React.render(<Rectangle intValue="10" stringValue="Hello" />
    , document.getElementById('container'));

<script src="https://facebook.github.io/react/js/jsfiddle-integration.js"></script>

<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

It seems that in case of integers (and actually for strings as well) I should be passing the numbers via {} like so:

React.render(<Rectangle intValue={10} stringValue={"Hello"} />, document.getElementById('container'));

You can either use:

<MyComponent param1={10} param2={20} />

Or:

<MyComponent {...{param1: 10, param2: 20}} />

Passing a number to a component

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