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  • I think that is not safe. For example it cannot have an element with a key of "length", the statement a1["length"] = "Hello world"; fails to store the entry. Also the statement a1["hasOwnProperty"] = "some prop"; totaly breaks the function Commented Oct 26, 2014 at 11:16
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    @PanosTheof I don't think you'd want it to store the value if you used the length property, any code that used it would have to ensure it did not try and store against length, but I guess that would be the same if it was a standard array too. Overriding hasOwnProperty on any object would most likely produce an undesired result. Commented Oct 27, 2014 at 0:03