Fix mul/div precedence to parse left to right (#126)

Multiply and divide should apply left to right when not parenthesized

scrapscript.py

···
     ">>": lp(14),
     "<<": lp(14),
     "^": rp(13),
-    "*": lp(12),
-    "/": lp(12),
+    "*": rp(12),
+    "/": rp(12),
     "//": lp(12),
     "%": lp(12),
     "+": lp(11),
···
         self.assertEqual(
             parse([IntLit(1), Operator("*"), IntLit(2), Operator("+"), IntLit(3)]),
             Binop(BinopKind.ADD, Binop(BinopKind.MUL, Int(1), Int(2)), Int(3)),
+        )
+
+    def test_mul_and_div_bind_left_to_right(self) -> None:
+        self.assertEqual(
+            parse([IntLit(1), Operator("/"), IntLit(3), Operator("*"), IntLit(3)]),
+            Binop(BinopKind.MUL, Binop(BinopKind.DIV, Int(1), Int(3)), Int(3)),
         )
 
     def test_exp_binds_tighter_than_mul_right(self) -> None:
···
         """
             ),
             Variant("true", Hole()),
+        )
+
+    def test_mul_and_div_have_left_to_right_precedence(self) -> None:
+        self.assertEqual(
+            self._run(
+                """
+        1 / 3 * 3
+        """
+            ),
+            Float(1.0),
         )