Major Description
In OAK-350 Blobs were made Comparable to make them easier to compare in higher-level code.
Unfortunately the implementation is broken (compareTo is not transitive) and potentially very slow for large binaries, which suggests that it shouldn't be exposed at least on the public API level.
Thus I suggest to drop the Comparable feature from Blobs and replace the few places where it is needed with equals() checks or explicit scanning of the streams.