Normative: Wrapped function should reuse target name and length

Fixes #338

spec.html

@@ -133,6 +133,20 @@ <h1>WrappedFunctionCreate ( _callerRealm_, _Target_ )</h1>
 			1. Set _wrapped_.[[Call]] as described in <emu-xref href="#sec-wrapped-function-exotic-objects-call-thisargument-argumentslist"></emu-xref>.
 			1. Set _wrapped_.[[WrappedTargetFunction]] to _Target_.
 			1. Set _wrapped_.[[Realm]] to _callerRealm_.
+			1. Let _L_ be 0.
+			1. Let targetHasLength be ? HasOwnProperty(_Target_, *"length"*).
+			1. If _targetHasLength_ is *true*, then
+			1. Let _targetLen_ be ? Get(_Target_, *"length"*).
+			1. If Type(_targetLen_) is Number, then
+				1. If _targetLen_ is *+&infin;*<sub>𝔽</sub>, set _L_ to +&infin;.
+				1. Else if _targetLen_ is *-&infin;*<sub>𝔽</sub>, set _L_ to 0.
+				1. Else,
+				1. Let _targetLenAsInt_ be ! ToIntegerOrInfinity(_targetLen_).
+					1. Assert: _targetLenAsInt_ is finite.
+					1. Set _L_ to max(_targetLenAsInt_, 0).
+			1. Perform ! SetFunctionLength(_wrapped_, _L_).
+			1. Let _name_ be ? Get(_Target_, *"name"*).
+			1. Perform ! SetFunctionName(_wrapped_, _name_, *"wrapped"*).
 			1. Return _wrapped_.
 		</emu-alg>
 	</emu-clause>