Re: [w3c/browser-payment-api] The myth of JSON-serializable object (#307)

We require JSON-serializable object to avoid this:
```javascript
var obj = {foo: null};
obj.foo = obj;
```
This is valid JavaScript, but cannot be serialized into a JSON string.

Serialization is necessary for communication to payment apps. Android apps can't receive JavaScript objects, so they take in a JSON string instead.

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