IsConstructor

[Boris Zbarsky]

On 6/13/14, 2:20 PM, Allen Wirfs-Brock wrote:
> The default @@create is approximately:
>
> Function.prototype[Symbol.create] = function(I) {
>      return Object.create(this.prototype)
> }

Ah, I see.  So the point is in normal use @@create is passed the right 
prototype to start with implicitly, via "this".

Doing that for @@create in the DOM might not be very backwards 
compatible, but we could probably do something like use the canonical 
prototype if "this" is the canonical constructor and else do this.prototype.

The main remaining issue with @@create is making all the DOM specs 
handle a created but not initialized object or something...  That's 
something I'd been hoping to avoid, since it requires wholesale changes 
to a bunch of specifications, not all of which are even actively edited. 
  :(  I suppose we could make things subclassable on an opt-on basis or 
something to work around that.

-Boris