assert: fix loose deepEqual map comparison

Loose map comparison had an logic error. It will now be properly
compared.

PR-URL: #24749
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>

Author: BridgeAR

lib/internal/util/comparisons.js

@@ -401,9 +401,7 @@ function mapMightHaveLoosePrim(a, b, prim, item, memo) {
       !innerDeepEqual(item, curB, false, memo)) {
     return false;
   }
-  const curA = a.get(altValue);
-  return curA === undefined && a.has(altValue) ||
-         innerDeepEqual(item, curA, false, memo);
+  return !a.has(altValue) && innerDeepEqual(item, curB, false, memo);
 }
 
 function setEquiv(a, b, strict, memo) {

test/parallel/test-assert-deep.js

@@ -380,6 +380,14 @@ assertOnlyDeepEqual(
   new Map([[1, {}]]),
   new Map([[true, {}]])
 );
+assertOnlyDeepEqual(
+  new Map([[undefined, true]]),
+  new Map([[null, true]])
+);
+assertNotDeepOrStrict(
+  new Map([[undefined, true]]),
+  new Map([[true, true]])
+);
 
 // GH-6416. Make sure circular refs don't throw.
 {