John Vilk f10c7cc154 Change ArrayBuffer.isView declaration to type guard for ArrayBufferView.
Also adds a test that checks that `ArrayBuffer.isView` appropriately narrows its argument to `ArrayBufferView`.

Fixes #5308.
2015-10-18 20:05:30 -04:00
..
2015-10-16 16:29:11 -07:00