No I get that, I'm not saying it should support those things, just saying you should probably document it clearly. People don't like to lose data. And append-o

No I get that, I'm not saying it should support those things, just saying you should probably document it clearly. People don't like to lose data. And append-only doesn't make you immune to corruption. There's still a possibility of two processes writing at the same time corrupting what gets written to the file.