fixup!

Author: BridgeAR

lib/internal/assert/assertion_error.js

@@ -10,6 +10,7 @@ const {
   ObjectDefineProperty,
   ObjectGetPrototypeOf,
   ObjectPrototypeHasOwnProperty,
+  SafeSet,
   String,
   StringPrototypeRepeat,
   StringPrototypeSlice,
@@ -42,7 +43,7 @@ const kReadableOperator = {
 const kMaxShortStringLength = 12;
 const kMaxLongStringLength = 512;
 
-const kMethodsWithCustomMessageDiff = new Set(['deepStrictEqual', 'strictEqual', 'partialDeepStrictEqual']);
+const kMethodsWithCustomMessageDiff = new SafeSet(['deepStrictEqual', 'strictEqual', 'partialDeepStrictEqual']);
 
 function copyError(source) {
   const target = ObjectAssign(