In light of this thread and the recent discussion about some kind of .? operator, I thought it'd be cool to actually make this and try it out. By having a bit of fine with the V8 API's* _MarkAsUndetectable_ *function and building on top of that, I was able to make a node module as an experiment in seeing it in action. Sadly I couldn't reproduce the behavior in Spidermonkey (the API is unimplemented in v8monkey and I couldn't find a way to do it).
I created an object (called nil) that is marked as undetectable (typeof is 'undefined', in null equality class, falsey) that returns itself for all property access (except for toStrnig), returns itself when called as a function, has null as a prototype, and returns the empty string when coerced to string. I also implemented a rough proxy wrapper that allows you to wrap an object such that in all places it normally would return undefined instead returns nil. I also created a recursive membrane version that wraps all non-primitive return values with the same kind of handler. https://github.com/Benvie/nil https://npmjs.org/package/nil
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