2.1.35 [ECMA-262/9:2018] Section 19.4.3.4 Symbol.prototype [ @@toPrimitive ] ( hint )

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V0178: Symbol.prototype[@@toPrimitive] is not implemented because @@toPrimitive is not implemented

The specification states:

 19.4.3.4 Symbol.prototype [ @@toPrimitive ] ( hint )
  
     This function is called by ECMAScript language operators to convert a Symbol object 
     to a primitive value. The allowed values for hint are "default", "number", 
     and "string".
  
     When the @@toPrimitive method is called with argument hint, the following steps are 
     taken:

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Symbol.prototype[@@toPrimitive] is not implemented because @@toPrimitive is not implemented.