v0.41.0-rc.8
[v0.41.0-rc.8](https://github.com/ash-project/ash_postgres/compare/v0.41.0-rc.7...v0.41.0-rc.8) (2021-10-25) Bug Fixes: * fix can? for :joins (#73) * remove unused default value * use proper identity names for polymorphic resources * set identity names propertly for polymorphic resources * handle nil values in snapshots better * remove unused field from snapshot parsing Improvements: * support `default` on aggregates * support `custom_indexes`