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2 points by conanite 3177 days ago | link | parent

There's a comment at the end of arc.arc that might be relevant:

  ; solution to the "problem" of improper lists: allow any atom as a list
  ;  terminator, not just nil.  means list recursion should terminate on
  ;  atom rather than nil, (def empty (x) (or (atom x) (is x "")))
But I think this means (len '(a b c . d)) would be 3, which may not be what you wanted.