2
msdsk
38d

I know null is not undefined and there is a very good reason for that - yet I'm still surprised every time something behaves differently depending on which is used.

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    Don't use arbitrary values, I guess... Loose comparison with boolean false is used for such ambuguity (undefined/null/0). That's up to conditions present in your script: you could as well use strict comparison to ensure that value is undefined.
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