I like the idea of having it on the Object object. The main thing is, that in JavaScript a lot of programmers use Objects as hashtables. I already have the pain of writing out Object.prototype.hasOwnProperty.call when i want to enumerate through objects (I know it could be replaced by variable, but still). Object.keys is clean in this aspect, i dont have to worry about, if one of the object's keys i got from a 3rd party API includes the key `keys`, I just use Object.keys, and I'm still safe (unless someone overwrites Object.keys, which is quite unlikely, and maybe it can be prevented in ES5).
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