All tests and test data are already excluded, and I don't think
cpan-mirrors belongs in the perl core either.
qr{^t/CPAN/authors/},
qw( lib/CPAN/Admin.pm
Makefile.PL
+ scripts/cpan-mirrors
SlayMakefile
t/00signature.t
t/04clean_load.t
t/31sessions.t
t/41distribution.t
t/42distroprefs.t
+ t/44cpanmeta.t
t/43distroprefspref.t
t/50pod.t
t/51pod.t
t/CPAN/TestPatch.txt
t/CPAN/modules/02packages.details.txt
t/CPAN/modules/03modlist.data
+ t/data/META-dynamic.json
t/data/META-dynamic.yml
+ t/data/META-static.json
t/data/META-static.yml
+ t/data/MYMETA.json
+ t/data/MYMETA.yml
t/local_utils.pm
t/perlcriticrc
t/yaml_code.yml