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I spend an increasing amount of my time looking at "Corrupted block detected" failures in decompression. Not infrequently, I suspect that it is the result of hardware failure, and that the blob has become bit-flipped or otherwise corrupted somewhere along the line. For that reason I was motivated to write a little tool to inspect blobs that fail to decompress, to try modifying them, and then check whether they decompress successfully. This seems like potentially a generally useful tool, so I figured it might be worth putting in `contrib/`.