Re: [w3c/browser-payment-api] editorial: clarify that payment handler data is converted (#536)

To be clear, trying to solve for:

```JS 
const methodData = [{
  supportedMethods: ["basic-card"],
  data: { supportedTypes: ['THIS IS NOT A VALID ENUM VALUE!!'] }
}];
const request = new PaymentRequest(methodData, details, options);
try {
 // When converting data, should `supportedTypes` cause `acceptPromise` to reject?
 const response = await request.show();
} catch(err) {

}
```


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