*.empty Idea

C. Scott Ananian ecmascript at cscott.net
Thu Apr 30 19:46:10 UTC 2015

I like the idea of snapshot methods, but they can be implemented in user
code using subclasses in ES6.  I'm particularly interested in the "lock
down in place" mechanism because it *cannot* be implemented in user code.

And yes, if we had it all to do over again, it would have been nice if the
Map prototype chain was:

Map instance -> Map.prototype -> ReadOnlyMap.prototype -> null

And clear/set/delete were properties of Map.prototype.

But that would still have required an explicit test in Map.clear/set/delete
to ensure that they were operating on an instanceof Map and not just on a
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