2.1.45 [ECMA-ES2017] Section 22.1.3.1.1 Runtime Semantics: IsConcatSpreadable ( O )

V0202: @@isConcatSpreadable is not implemented

The specification states:

 22.1.3.1.1 Runtime Semantics: IsConcatSpreadable ( O )
  
     The abstract operation IsConcatSpreadable with argument O performs the following 
     steps:
  
         1.  If Type(O) is not Object, return false.
         2.  Let spreadable be ? Get(O, @@isConcatSpreadable).
         3.  If spreadable is not undefined, return ToBoolean(spreadable).
         4.  Return ? IsArray(O).

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@@isConcatSpreadable is not implemented.