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Re: proposing a simpler mechanism Taylor R Campbell 13 Nov 2009 04:31 UTC 
   Date: Thu, 12 Nov 2009 19:55:40 -0800
   From: Thomas Bushnell BSG <xxxxxx@becket.net>

   What do you expect procedure-arity to return for a procedure which
   accepts any number of arguments?  IEEE +inf?

-1, presumably.  The numerical value isn't significant; its
representation as a bit string in two's-complement is what matters,
and for -1 that is a bit string of all ones.