Set and return the original bytes for ABs in GetModifySetValueInBuffer

Author: syg

spec.html

@@ -37013,8 +37013,9 @@ <h1>GetModifySetValueInBuffer ( _arrayBuffer_, _byteIndex_, _type_, _value_, _op
             1. Append _rmwEvent_ to _eventList_.
             1. Append Chosen Value Record { [[Event]]: _rmwEvent_, [[ChosenValue]]: _rawBytesRead_ } to _execution_.[[ChosenValues]].
           1. Else,
-            1. Let _rawBytesAtIndex_ be a List of _elementSize_ containing, in order, the _elementSize_ sequence of bytes starting with _block_[_byteIndex_].
-            1. Let _rawBytesRead_ be _op_(_rawBytesAtIndex_, _rawBytes_).
+            1. Let _rawBytesRead_ be a List of _elementSize_ containing, in order, the _elementSize_ sequence of bytes starting with _block_[_byteIndex_].
+            1. Let _rawBytesModified_ be _op_(_rawBytesRead_, _rawBytes_).
+            1. Store the individual bytes of _rawBytesModified_ into _block_, in order, starting at _block_[_byteIndex_].
           1. Return RawBytesToNumeric(_type_, _rawBytesRead_, _isLittleEndian_).
         </emu-alg>
       </emu-clause>