Re: Notification for new navigation timing entries

Yeah it seems like we should ditch the typedef rename and introduce a new
LazyPerformanceEntryArray object.

The design goal I had in mind for this was to avoid construction of
PerformanceEntry objects until you actually needed them. Accessing these
entries is quite slow to just buffering them.

That is, it was intentional to not have forEach and other things on these
arrays. This is like NodeList --- QuerySelectorAll gives back a ton of
stuff, but you have to work to get the actual contents.

In this case, too, good performance timing discipline requires you to not
crack open performance events when you get these records.

So basically, I actually think its bad to support forEach on the object
without some additional work....

We could, perhaps, have a sequence<PerformanceEntry> AsSequence() method
for people who want to treat this as a seuence?