Defaultdict mixin #54
Description
We could consider a trait that mixes __missing__, e.g. to simplify https://github.com/databio/refgenconf/blob/master/refgenconf/refgenconf.py#L171-L183
{{ message }}
We could consider a trait that mixes __missing__, e.g. to simplify https://github.com/databio/refgenconf/blob/master/refgenconf/refgenconf.py#L171-L183