2.1.60 [ECMA-262/9:2018] Section 25.6.4 Properties of the Promise Constructor

V0106: The Promise.length property is not configurable

The specification states:

 25.6.4 Properties of the Promise Constructor
  
     The Promise constructor:
  
         • has a [[Prototype]] internal slot whose value is the intrinsic object 
         %FunctionPrototype%.
         • has the following properties:

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The Promise.length property is not configurable.