JSTests/stress/typed-array-constructor-undefined.js - WebKit - Git at Google

 // Undefined for length argument of typed array constructor should be treated
 // the same as if the argument was omitted, meaning the whole buffer is used.
 if (new Uint8Array(new ArrayBuffer(3), 0, undefined).length != 3)
     throw "undefined length should result in the whole buffer being used";
	// Undefined for length argument of typed array constructor should be treated
	// the same as if the argument was omitted, meaning the whole buffer is used.
	if (new Uint8Array(new ArrayBuffer(3), 0, undefined).length != 3)
	throw "undefined length should result in the whole buffer being used";