Bug 184232

Hi I've noticed that when I create a typed array, the resulting array's byteLength is different if I'm not passing a length, or if I'm passing an undefined length: const buffer = new ArrayBuffer(8); const view1 = new Uint8Array(buffer); // byteLength == 8 const view2 = new Uint8Array(buffer, undefined, undefined); // byteLength == 0 Tested with the JSC shell from my WebKit fork, forked on github on February, and with Safari on iOS 11.2.6. According to to the ecma standard (https://www.ecma-international.org/ecma-262/6.0/#sec-%typedarray%-buffer-byteoffset-length) I think they should produce typed arrays with the same byteLength. I've verified it with Firefox nightly and Chrome nightly (both on Windows), both producing a Uint8Array with the same byteLength(8). Going through JSC's source, I think the issue is in constructGenericTypedArrayView in runtime/JSGenericTypedArrayViewConstructorInlines.h. It handles undefined byteLength for DataViews, but not the "length" for other typed arrays. Thanks, Koby