Editorial: Guard TypedArray methods from non-exotic receivers

spec.html

@@ -8358,7 +8358,7 @@ <h1>[[Get]] ( _P_, _Receiver_ )</h1>
         <p>When the [[Get]] internal method of an Integer-Indexed exotic object _O_ is called with property key _P_ and ECMAScript language value _Receiver_, the following steps are taken:</p>
         <emu-alg>
           1. Assert: IsPropertyKey(_P_) is *true*.
-          1. If Type(_P_) is String, then
+          1. If SameValue(_O_, _Receiver_) and Type(_P_) is String, then
             1. Let _numericIndex_ be ! CanonicalNumericIndexString(_P_).
             1. If _numericIndex_ is not *undefined*, then
               1. Return ? IntegerIndexedElementGet(_O_, _numericIndex_).
@@ -8371,7 +8371,7 @@ <h1>[[Set]] ( _P_, _V_, _Receiver_ )</h1>
         <p>When the [[Set]] internal method of an Integer-Indexed exotic object _O_ is called with property key _P_, value _V_, and ECMAScript language value _Receiver_, the following steps are taken:</p>
         <emu-alg>
           1. Assert: IsPropertyKey(_P_) is *true*.
-          1. If Type(_P_) is String, then
+          1. If SameValue(_O_, _Receiver_) and Type(_P_) is String, then
             1. Let _numericIndex_ be ! CanonicalNumericIndexString(_P_).
             1. If _numericIndex_ is not *undefined*, then
               1. Return ? IntegerIndexedElementSet(_O_, _numericIndex_, _V_).