assert: fix loose deepEqual arrays with undefined and null failing

The comparison has to accept these as identical.

Fixes: #61583

Author: BridgeAR

lib/internal/util/comparisons.js

@@ -999,9 +999,9 @@ function objEquiv(a, b, mode, keys1, keys2, memos, iterationType) {
         if (!hasOwn(b, i))
           return sparseArrayEquiv(a, b, mode, memos, i);
         if (a[i] !== undefined || !hasOwn(a, i))
-          return false;
+          return mode !== kLoose ? false : a[i] === null;
       } else if (a[i] === undefined || !innerDeepEqual(a[i], b[i], mode, memos)) {
-        return false;
+        return mode !== kLoose ? false : b[i] === null;
       }
     }
   } else if (iterationType === kIsSet) {

test/parallel/test-assert-deep.js

@@ -126,6 +126,10 @@ test('deepEqual', () => {
   }
 });
 
+test('loose deepEqual', () => {
+  assertOnlyDeepEqual([null, undefined, undefined], [null, undefined, null])
+});
+
 test('date', () => {
   assertNotDeepOrStrict(date, date2);
   assert.throws(
@@ -246,6 +250,13 @@ function assertOnlyDeepEqual(a, b, err) {
     () => assert.deepStrictEqual(b, a),
     err || { code: 'ERR_ASSERTION' }
   );
+
+  const partial = mustCall(() => {
+    assert.partialDeepStrictEqual(b, a);
+    assert.partialDeepStrictEqual(a, b);
+  });
+
+  assert.throws(partial, err || { code: 'ERR_ASSERTION' });
 }
 
 test('es6 Maps and Sets', () => {