+```
+| | Host types that are allowed | Are merged `/usr` | Official packages are built on | Packages built on … can break on the other |
+| Codename | classical hosts | merged `/usr` hosts | symlinks allowed | classical hosts | merged `/usr` hosts | classical hosts | merged `/usr` hosts |
+|----------|-----------------|---------------------|-------------------|—----------------|---------------------|---------------------|----------------------|
+| none | yes | no | no | yes | no | yes | yes |
+| weak | yes | yes | yes | yes | no | no | yes |
+| middle | yes | yes | yes | yes | yes | no | no |
+| hard | yes | yes | yes | no | yes | no | no |
+| all | no | yes | yes | no | yes | yes | no |
+```