          1. Let _S_ be the *this* value.
          1. Perform ? RequireInternalSlot(_S_, [[SetData]]).
          1. Let _entries_ be the List that is _S_.[[SetData]].
          1. For each element _e_ of _entries_, do
            1. Replace the element of _entries_ whose value is _e_ with an element whose value is ~empty~.
          1. Return *undefined*.