Style poll, which do you prefer? Yes they are slightly different, but the edge case of a key pointing to undefined might not matter...
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yeah, should of added more options. Also `o[k] == null` is a good option.
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If I mean to test for either null or undefined, I'll usually do (x === undefined || x === null) explicitly to capture that intent.
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I use `in` because I want to test if an object has a key. If someone gives me an object with a key pointing to `undefined`, whatever.
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