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truth of '()
I don't recall that we have any consensus for eventually declaring that
implementations -must- have distinct () and #F objects. My understanding
is that making the boolean significance of () unspecified is to accommodate
implementations in which they are distinct, where it might be inconvenient
to arrange for () to be false.
I agree completely with Alan. I might encourage implementors and
dialect designers to distinguish () and #f. I might even distinguish
them myself if I were designing a new dialect, but I would never agree
to forcing them to be distinct.