Re: [heycam/webidl] Remove [LegacyArrayClass] (#291)

That's equivalent to doing an array cast (`el.toArray().map()` vs `[...el].map()`). It's just one more step that people have to do to use the value "normally".  This was bad when querySelectorAll() did it, and it's bad here, too.

Maplikes/setlikes get the full suite of Map/Set functions automatically; you don't need to cast them into a Map/Set to use them.  People very often want to map/forEach/etc a sequence-ish value.  I know that getting `a[0]` to work on an array-like is out of the question right now (grr), but we can do everything else with fairly minimal pain.

-- 
You are receiving this because you are subscribed to this thread.
Reply to this email directly or view it on GitHub:
https://github.com/heycam/webidl/issues/291#issuecomment-283467040