diff --git a/lib/utils/lru.js b/lib/utils/lru.js
index 58f56e06..be4ae297 100644
--- a/lib/utils/lru.js
+++ b/lib/utils/lru.js
@@ -122,8 +122,6 @@ class LRU {
     if (this.capacity === 0)
       return;
 
-    key = String(key);
-
     let item = this.map.get(key);
 
     if (item) {
@@ -158,8 +156,6 @@ class LRU {
     if (this.capacity === 0)
       return null;
 
-    key = String(key);
-
     const item = this.map.get(key);
 
     if (!item)
@@ -180,7 +176,7 @@ class LRU {
   has(key) {
     if (this.capacity === 0)
       return false;
-    return this.map.has(String(key));
+    return this.map.has(key);
   }
 
   /**
@@ -193,8 +189,6 @@ class LRU {
     if (this.capacity === 0)
       return false;
 
-    key = String(key);
-
     const item = this.map.get(key);
 
     if (!item)