There was a bit of compat code from upstream commit fdacdb85533721396789c6185b06a3a1e8148292 which went away in dnf-2 that allowed base.group_install to accept a base.comp.Group object as its first argument instead of a string. Unfortunately the "Changes in DNF-2 compared to DNF-1" document says only: " Following API methods accept different arguments [...] dnf.Base.group_install() " I had assumed that the change was only the addition of the third optional argument, but it's actually a bit more significant and unfortunately this broke Ansible's DNF module. I guess there's no undoing the change, but it would be nice to have it more fully documented. I'd argue that a warning on the improper API usage would have been good as well, but it's a bit late for that now.
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