> > >> > Neither of them are fit for standardization. Selfish and Prototype are > both incapable of correctly "deep copying" arrays or objects, >
Why does it matter that they don't deep copy? Deep copying is a difficult problem that needs to be standardized separately. I've personally avoided deep copying for this reason and don't use it anymore. One can accept that an extend is merely a shallow copy properties by reference, because this (although limited) behavior is easy to understand. I have a version of Object.extend<https://github.com/Raynos/pd/blob/master/src/pd.js#L82> that is a "shallow own merge". However having a deep copy mechanism that works without obscure edge-cases would be great. Of course it would be nice if we had the choice of deep vs shallow copy within the API.
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