Krikri::FactsGatherer::BadSubsetError
Raised for a positive gather_subset token real Ansible rejects -
get_collector_names raises TypeError("Bad subset '%s' given to
Ansible. ...") and setup's fail_json surfaces it as a module
failure (live-verified against 2.19.4: gather_subset=bogus and
even gather_subset= (empty string) both fail the module; a
NEGATED unknown token like !bogus is silently ignored there).