I have a pureComputed that returns a javascript Date object. I register a subscription to the pureComputed's changes using .subscribe. However, the subscription is triggered even when the same value is returned by the pureComputed.

The reason is explained at http://knockoutjs.com/documentation/computedObservables.html which states:

When a computed observable returns a primitive value (a number, string, boolean, or null), the dependencies of the observable are normally only notified if the value actually changed.

My pureComputed does not hold a "primitive value", but instead a javascript Date object. Would it be reasonable to request knockout to handle a javascript Date object the same way as it currently handles "primitive values" (perhaps by using .valueOf())?