add testcase for explicit undefined this
MODIFY
test/realm/test-confinement.js
test/realm/test-confinement.js
@@ -16,6 +16,7 @@ test('constructor this binding', t => {
t.equal(F(), undefined);
t.equal(F.call(8), 8);
+ t.equal(F.call(undefined), undefined);
t.equal(Reflect.apply(F, 8, []), 8);
const x = { F };

add testcase for explicit undefined this