Work around a jest/nodejs issue where instanceof ArrayBuffer fails

[ericvergnaud]

Work around a jest/nodejs issue where instanceof ArrayBuffer fails due to a nodes sandbox issue See https://github.com/nodejs/node/issues/20978, marked as fixed, but seems to resurface with node 10.15.3 and jest 24.7.1

[gabberr]

The use of instanceof ArrayBuffer is also problematic in Safari. Checking instanceof of an ArrayBuffer in the window context will return false for ArrayBuffers created in a different context, e.g. an iframe. I think this should fix it 👍

See: https://github.com/feross/buffer/issues/166

The test environment is that of the Karma test runner, which uses an iframe to isolate test code from the runner's code. As a result, the ArrayBuffer constructor object in the code's context is not referentially equivalent to the ArrayBuffer constructor object in the main window context.

There was a similar fix in this repo for the Blob

https://github.com/Stuk/jszip/pull/350