Because many of the base infrastructure libraries are compatible as long as they used interfaces (grumble grumble os.File). I would be very surprised if this doesn't implement net/http/ServeHTTP
If it was "github.com/foo/poppycock" I could just write import mux "github.com/foo/poppycock" and use it as mux.
Import name similarity is a terrible argument for picking a name.