New Set.prototype methods

[Michał Wadas]

I have written proposal for new Set.prototype methods.

https://github.com/Ginden/set-methods

New methods would be:

   - Set.prototype.filter
   - Set.prototype.map
   - Set.prototype.some
   - Set.prototype.every
   - Set.prototype.find
   - Set.prototype.union
   - Set.prototype.intersect
   - Set.isSet


TBA:

   - Set.prototype.difference (or .except)

%SetIteratorPrototype% is discussed in text.

BTW, is there any way to subclass SetIterator or check if object is
SetIterator? If not it seems like issue for subclassing Set.
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