How to create Stripe elements postal code that accepts UK postcodes? : <p>I'm creating a payment form with separate Stripe Elements:</p>

<pre class="lang-js prettyprint-override"><code>var stripe = Stripe(...);
var elements = stripe.elements();
...
var postalCode = elements.create('postalCode');
postalCode.mount('#postalCode');
</code></pre>

<p>This creates a field that accepts only digits. However, the UK's post codes contain letter as well. How do I allow these too? I want the user to be able to input pretty much any possible post code in the world.</p>
