             "length":   { $0.count },
             "list":     { List($0) },
             "list?":    { $0 is List },
-            //            "map":     map,
+            // "map":     map, // TODO
             "max":      max,
             "min":      min,
             "not":      { !$0 },

            "ceil":     ceil,
            "copysign": copysign,
            "fabs":     fabs,
            //            "factorial": factorial,
            "floor":    floor,
            "fmod":     fmod,
            "frexp":    frexp,
            //            "fsum": fsum,
            "isinf":    isinf,
            "isnan":    isnan,
            "ldexp":    ldexp,

            "=":        { $0 = $1 },
            // Misc.
            "abs": abs,
            // "append": op.add, // TODO
            // "apply": apply, // TODO
            "begin":    { $0[-1] },
            "car":      { $0[0] },
            "cdr":      { $0.dropFirst() },
