This approach was the wrong way :-) Nothing like commit driven discus…

…sion :-)

This reverts commit 20854f0.

src/core/List.pm

@@ -73,13 +73,16 @@ my class List does Positional { # declared in BOOTSTRAP
         nqp::p6parcel($rpa, Any);
     }
 
-    method default() { Nil }
-    multi method at_pos(List:D: \pos) is rw {
-        return Nil unless self.DEFINITE;
-        self.gimme(pos + 1);
-        nqp::existspos($!items, nqp::unbox_i(pos.Int))
-          ?? nqp::atpos($!items, nqp::unbox_i(pos.Int))
-          !! self.VAR.default;
+    multi method at_pos(List:D: $pos is copy) is rw {
+        $pos = $pos.Int;
+        self.exists($pos)
+          ?? nqp::atpos($!items, nqp::unbox_i($pos))
+          !! Nil
+    }
+    multi method at_pos(List:D: int $pos) is rw {
+        self.exists($pos)
+            ?? nqp::atpos($!items, $pos)
+            !! Nil;
     }
 
     method eager() { self.gimme(*); self }