| Index: src/ic/ic.cc
 | 
| diff --git a/src/ic/ic.cc b/src/ic/ic.cc
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| index fa04e0fca0a770b9a4ece9b9406d3b9cbf127f39..0baba966a4b27681eb94336b4f6e9fb172e12e7e 100644
 | 
| --- a/src/ic/ic.cc
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| +++ b/src/ic/ic.cc
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| @@ -1579,6 +1579,8 @@ static Handle<Object> TryConvertKey(Handle<Object> key, Isolate* isolate) {
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|      }
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|    } else if (key->IsUndefined(isolate)) {
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|      key = isolate->factory()->undefined_string();
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| +  } else if (key->IsString()) {
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| +    key = isolate->factory()->InternalizeString(Handle<String>::cast(key));
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|    }
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|    return key;
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|  }
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| 
 |