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I was able to reproduce specifically the exception with the [object Blob] thing on LinkedIn (which I believe is the same issue).
This happens because LinkedIn uses whatwg-fetch which tries to tell what is the type of a message body parameter.
To determine whether it is a Blob, it runs support.blob && Blob.prototype.isPrototypeOf(body) where true indicates it is a Blob.
Since our wrap makes Blob inherit from Function instead of Blob, this fails and we end up on a different conclusion which results in a shitstorm basically.
Moreover, Current implementation is not secure enough.
One can get a hold on a Blob instance that is not created via new Blob() and thus bypassing Snow.
For example, XHR when configured right responds with a native Blob object which obviously isn't affected by our monkey patching.
These issues require attention, especially making sure web apps don't break when running on Snow