Fix
* Change to type instead of instantiated type ([`e327665`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/e3276650ad1751d4c325256b91856c94b1567b99))
* Misc ([`46c6707`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/46c670727c25ae8e5552a412e867f2e3791dc473))
* Validate fallback is compatible with output of aggregator ([`6fe230b`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/6fe230bd5889e4a89215a08c4e0b9130c105f920))