I'm not aware of anything published, but the code is open source, and if you're so inclined you can probably point a clanker at it. The second one is called "redaction" in Mononoke, I believe (obliteration is a different term for it, as is censorship).
You are correct that integer sequence numbers and redaction are both reasonable things to want -- we just believed (for a variety of reasons) that the core should be Merkle and that these things should be built on top.
You are correct that integer sequence numbers and redaction are both reasonable things to want -- we just believed (for a variety of reasons) that the core should be Merkle and that these things should be built on top.