On www.collectionsjs.com I was momentarily confused when confronted with the checkbox:
[ ] Should be ordered and iterable.
Because I wanted a set that was iterable (which is to say: not a WeakSet), but I did not need it to be ordered in any particular way. Upon investigation I found out that leaving the box unchecked recommends FastSet, which is still iterable.
So shouldn't the checkbox just say:
[ ] Should be ordered