Normative: Allow transferring SharedArrayBuffer objects

spec.html

@@ -233,12 +233,27 @@ <h1>GetWrappedValue ( _callerRealm_, _value_ )</h1>
 			<emu-alg>
 				1. Assert: _callerRealm_ is a Realm Record.
 				1. If Type(_value_) is Object, then
-				  1. If IsCallable(_value_) is *false*, throw a TypeError exception.
-				  1. Return ! WrappedFunctionCreate(_callerRealm_, _value_).
+					1. If IsCallable(_value_) is *true*,
+						1. Return ! WrappedFunctionCreate(_callerRealm_, _value_).
+					1. If _value_ has an [[ArrayBufferData]] internal slot, then
+						1. If IsSharedArrayBuffer(_value_) if *true*, return ? CloneSharedArrayBuffer(_value_, _callerRealm_.[[Intrinsics]].%SharedArrayBuffer%).
+					1. throw a TypeError exception.
 				1. Return _value_.
 			</emu-alg>
 		</emu-clause>
 
+		<emu-clause id="sec-validateshadowrealmobject" aoid="ValidateShadowRealmObject">
+			<h1>CloneSharedArrayBuffer ( _buffer_, _constructor_ )</h1>
+			<emu-alg>
+				1. Assert: _buffer_ is an Object with a [[SharedArrayBuffer]] internal.
+				1. Let _clone_ be ? OrdinaryCreateFromConstructor(_constructor_, "%SharedArrayBuffer.prototype%", « [[ArrayBufferData]], [[ArrayBufferByteLength]] »).
+				1. Assert: _value_ and _clone_ are instances of SharedArrayBuffer of different Realms each.
+				1. Set _clone_.[[ArrayBufferData]] to _value_.[[ArrayBufferData]].
+				1. Set _clone_.[[ArrayBufferByteLength]] to _value_.[[ArrayBufferByteLength]].
+				1. Return _clone_.
+			</emu-alg>>
+		</emu-clause>
+
 		<emu-clause id="sec-validateshadowrealmobject" aoid="ValidateShadowRealmObject">
 			<h1>ValidateShadowRealmObject ( _O_ )</h1>
 			<p>The abstract operation ValidateShadowRealmObject takes argument _O_. It performs the following steps when called:</p>