Hi,
var o = {};
WeakMap.call(o);
WeakSet.call(o);
Map.call(o);
Set.call(o);
Currently, this works and makes o a weakmap, a weakset, a map and a set...
I understand collections were spec'ed to enable subclassing, but I don't
see the value of being able to subclass this way (I think Jason
Orendorff already made the comment somewhere but I can't find it).
Would it rather make sense that instead of internal [[WeakMapData]],
[[MapData]], etc. each would work with a single [[CollectionData]] slot
which value can change depending on how it's been defined?
It would still be possible to subclass each (which is the minimum class
syntax needs since it's not possible to inherit from several things),
but remove the possibility to subclass several of them.
David
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