2.1.79 [ECMA-262-1999] Section 15.5.4, Properties of the String Prototype Object

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The String prototype object is itself a String object #(its [[Class]] is "String")# whose value is an empty string. __For JScript 5.x, the [[Class]] of the String prototype object is "Object".__

The value of the internal [[Prototype]] property of the String prototype object is the Object prototype object ([ECMA-262-1999] section 15.2.3.1).