Fixed support for maxAge=0

[tomarad]

Hey,
According to this spec when Access-Control-Max-Age is not set, it is up to the user agent to decide the value.
The check options.maxAge is faulty when maxAge equals to zero, causing it to return null, not 0 and different behaviors on different browsers.

Thanks!
Tom

[dougwilson]

Great catch! Can you add a test to our test suite as well? It will prevent accidentally regressing the behavior.

Let us know if you need help adding the test if needed 👍

[tomarad]

Sure, added one :)