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 ReadOnlyMap. --scott
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