Errors encountered when running tests in Internet Explorer 11 and MS Edge

[jeskew]

I've consistently seen two unit test failures when running the test suite in IE and Edge. Both appear to be related to blob usage, probably stemming from how blobs are read in AWS.util.crypto.hash.

Error log:

Edge 15.15063.0 (Windows 10 0.0.0) Integration tests AWS.S3 progress events emits http(Upload|Download)Progress events (no phantomjs) FAILED
        Unspecified error. thrown
IE 11.0.0 (Windows 10 0.0.0) AWS.util.crypto sha256 handles Blobs (no phantomjs) FAILED
        InvalidStateError: InvalidStateError

Potentially related: https://gist.github.com/Prinzhorn/5a9d7db4e4fb9372b2e6

[lock]

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