diff --git a/lib/helpers/clone.js b/lib/helpers/clone.js
index fafb2f3063b..b0e37f6cfba 100644
--- a/lib/helpers/clone.js
+++ b/lib/helpers/clone.js
@@ -17,7 +17,7 @@ const trustedSymbol = require('./query/trusted').trustedSymbol;
  *
  * If options.minimize is true, creates a minimal data object. Empty objects and undefined values will not be cloned. This makes the data payload sent to MongoDB as small as possible.
  *
- * Functions are never cloned.
+ * Functions and primitives are never cloned.
  *
  * @param {Object} obj the object to clone
  * @param {Object} options
@@ -30,6 +30,9 @@ function clone(obj, options, isArrayChild) {
   if (obj == null) {
     return obj;
   }
+  if (typeof obj === 'number' || typeof obj === 'string' || typeof obj === 'boolean' || typeof obj === 'bigint') {
+    return obj;
+  }
 
   if (Array.isArray(obj)) {
     return cloneArray(isMongooseArray(obj) ? obj.__array : obj, options);
@@ -148,13 +151,12 @@ function cloneObject(obj, options, isArrayChild) {
     ret[trustedSymbol] = obj[trustedSymbol];
   }
 
-  let i = 0;
-  let key = '';
   const keys = Object.keys(obj);
   const len = keys.length;
 
-  for (i = 0; i < len; ++i) {
-    if (specialProperties.has(key = keys[i])) {
+  for (let i = 0; i < len; ++i) {
+    const key = keys[i];
+    if (specialProperties.has(key)) {
       continue;
     }