RE: undefined being treated as a missing optional argument

[Domenic Denicola]

I'm sympathetic toward `undefined` as a sentinel for "no value of the expected 
type," whereas `null` means "we have a value of the expected type, but that 
value represents 'nothing.'" Not sure if anyone else sees it that way, though, 
and admittedly it's based on vague hand-wavey arguments.
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