Editorial: splice: consolidate redundant count variables (tc39#2732)

See tc39#2595.

spec.html

@@ -37934,15 +37934,15 @@ <h1>Array.prototype.splice ( _start_, _deleteCount_, ..._items_ )</h1>
           1. If _relativeStart_ is -&infin;, let _actualStart_ be 0.
           1. Else if _relativeStart_ &lt; 0, let _actualStart_ be max(_len_ + _relativeStart_, 0).
           1. Else, let _actualStart_ be min(_relativeStart_, _len_).
-          1. Let _insertCount_ be the number of elements in _items_.
+          1. Let _itemCount_ be the number of elements in _items_.
           1. If _start_ is not present, then
             1. Let _actualDeleteCount_ be 0.
           1. Else if _deleteCount_ is not present, then
             1. Let _actualDeleteCount_ be _len_ - _actualStart_.
           1. Else,
             1. Let _dc_ be ? ToIntegerOrInfinity(_deleteCount_).
             1. Let _actualDeleteCount_ be the result of clamping _dc_ between 0 and _len_ - _actualStart_.
-          1. If _len_ + _insertCount_ - _actualDeleteCount_ &gt; 2<sup>53</sup> - 1, throw a *TypeError* exception.
+          1. If _len_ + _itemCount_ - _actualDeleteCount_ &gt; 2<sup>53</sup> - 1, throw a *TypeError* exception.
           1. Let _A_ be ? ArraySpeciesCreate(_O_, _actualDeleteCount_).
           1. Let _k_ be 0.
           1. Repeat, while _k_ &lt; _actualDeleteCount_,
@@ -37952,7 +37952,6 @@ <h1>Array.prototype.splice ( _start_, _deleteCount_, ..._items_ )</h1>
               1. Perform ? CreateDataPropertyOrThrow(_A_, ! ToString(𝔽(_k_)), _fromValue_).
             1. Set _k_ to _k_ + 1.
           1. Perform ? Set(_A_, *"length"*, 𝔽(_actualDeleteCount_), *true*).
-          1. Let _itemCount_ be the number of elements in _items_.
           1. If _itemCount_ &lt; _actualDeleteCount_, then
             1. Set _k_ to _actualStart_.
             1. Repeat, while _k_ &lt; (_len_ - _actualDeleteCount_),