[simcop2387]

> If you change the structure of some fundamental primitive type like how strings are represented, then you're probably going to have to rewrite your whole pmem arena.

That's part of the reason why I was thinking something like Cap'n Proto or Protocol Buffers might make sense for a lot of structures. You pay a bit of cost for writing but get to gracefully handle upgrades to the structure if you do it right. I'd imagine you want to use something higher level just above them to organize the records. But this is all a really new area of thinking about this so I'm probably being a bit obtuse about it.