The previous constraint was forcing it to be an integer :wink: So whatever we can come up with, we've already improved that situation.

*If possible* however, I'd like to not enforce any constraints. As far as I can tell this should not be an issue: The subgraph name will only be used in the dot file and will not be shown in the final image file, so it *should probably* be okay to use an arbitrary/random identifier and make sure to add the *real* group ID as a subgraph label (which is already done one line below).