— So I can't count on them not being dumb
Since it is common practice to use highly sparse arrays with lots of unassigned and assigned-to-undefined indexes, I need to be able to process them
— Do you have a link to play with?
— At this rate it may be faster to use a slower for...in loop
— Hm, much faster
— Yes, i was about to proposing this
— Backwards compat, fix it and you break the web
— 10/10 useful bot