[v2.6.4](https://github.com/ash-project/ash/compare/v2.6.3...v2.6.4) (2023-02-15)
Bug Fixes:
* handle cases where union type is already atom
* various union fixes
* make `depend_on_resources` more reliable
* use `load/3` for builtin concat calc
Improvements:
* Add error message when page is added but pagination is not enabled (#511)
* add union type and some tests around it
* add union short name
* add union type
* better operator type casting and expression fixes