[patch] [[Prototype]]s are only compared in strict mode

Author: ljharb

index.js

@@ -104,8 +104,8 @@ function objEquiv(a, b, opts) {
   if (aIsDate !== bIsDate) { return false; }
   if (aIsDate || bIsDate) { // && would work too, because both are true or both false here
     if ($getTime(a) !== $getTime(b)) { return false; }
-    if (opts.strict && gPO && gPO(a) !== gPO(b)) { return false; }
-  } else if (gPO && gPO(a) !== gPO(b)) { return false; } // non-Dates always compare [[Prototype]]s
+  }
+  if (opts.strict && gPO && gPO(a) !== gPO(b)) { return false; }
 
   var aIsBuffer = isBuffer(a);
   var bIsBuffer = isBuffer(b);

test/cmp.js

@@ -422,7 +422,7 @@ test('[[Prototypes]]', { skip: !Object.getPrototypeOf }, function (t) {
   var instance = new C();
   delete instance.constructor;
 
-  t.deepEqualTest({}, instance, 'two identical objects with different [[Prototypes]]', false, false);
+  t.deepEqualTest({}, instance, 'two identical objects with different [[Prototypes]]', true, false);
 
   t.test('Dates with different prototypes', { skip: !Object.setPrototypeOf }, function (st) {
     var d1 = new Date(0);