### v0.3.0
* Actually build on non-linux. :(
### v0.2.0
* Object, not free function.
* `persist_noclobber` now returns `PersistError` containing `Self`,
allowing recovery from failure.
* add `persist_by_rename`, utilising the above behaviour.
### v0.1.1
* Expose internal type name, so users can name it.