code: function InternalPropertyMirror(name, value) {
    %_Call(Mirror, this, MirrorType.INTERNAL_PROPERTY_TYPE);
    this.name_ = name;
    this.value_ = value;
  }
docs: Mirror object for internal properties. Internal property reflects properties
  not accessible from user code such as [[BoundThis]] in bound function.
  Their names are merely symbolic.
  @param {string} name The name of the property
  @param {value} property value
  @constructor
  @extends Mirror