At the last TC39 meeting, it was agreed tothat the set/add methods would return 
the collection that to which something is being added.

This supports code patterns like:

someMap.set(key1,value1).set(key2,value3);

In making this change to the spec. I noticed several other methods that could 
reasonably be used in this same pattern. For example:

someMap.clear().set(aKey, aValue);

someSet.delete(oldMember).add(newMember);

Are there any objections to making the clear and delete methods of 
Map/WeakMap/Set also return the collection, just like set/add?

Allen



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