What's Changed
Optimizations and performance improvements.
* Always factorize early by dcherian in https://github.com/xarray-contrib/flox/pull/234
* Handle min_count=0 by dcherian in https://github.com/xarray-contrib/flox/pull/238
* Optimize broadcasting by dcherian in https://github.com/xarray-contrib/flox/pull/230
**Full Changelog**: https://github.com/xarray-contrib/flox/compare/v0.6.10...v0.7.0