Tests: new test for phys_equal

Author: hhugo

compiler/tests-jsoo/test_obj.ml

@@ -70,3 +70,9 @@ let%expect_test "dup" =
     true
     true
   |}]
+
+let%expect_test "sameness" =
+  print_bool (nan == nan);
+  [%expect {| false |}];
+  print_bool (-0. == 0.);
+  [%expect {| true |}]