Add a note that `merge-default` and `fuse-default` aren't algebraically closed. Should we redesign these or remove them?
Add a note that `merge-default` and `fuse-default` aren't algebraically closed. Should we redesign these or remove them?

rocketnia/era-cene,era-platform/cene,era-platform/cene,rocketnia/era-cene,rocketnia/era-cene,era-platform/cene