expose Stream.prototype?

I like to write extensions to this library.
Right now I alter EventEmitter.prototype so that internal highland Stream function inherits my methods as well.
Is it possible to somehow expose Stream object so I can add my methods to it?

Start by reviewing the library's public Stream object and the internal Highland Stream function, then compare how EventEmitter.prototype is currently extended. Define what exposing Stream should mean for extension authors and how completion would be verified; the issue does not mention specific files or tests.

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