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Re: #f = #none ?

Oopth!  An 8:45 is too early for me to post posting correction:

        3) Use this special form in the places where #f is currently supplied
           as a bottom value.  If desired, multiple special forms could be

    One for (parameter-specified?...) one for (variable-bound-by-bind?...) etc.
    I do prefer the idea of having a single (specified?...) special-form,

           given (along the vein of slot-initialized?), or all these could be
           unified under a single name.  In all other cases, an attempt to
           access these values should result in an exception.

	-- Scot