https://rt.cpan.org/Ticket/Display.html?id=88903 got solved \o/
# which ones of the above can fail
allow_failures:
-
- # Fails tests because of https://github.com/Perl-Toolchain-Gang/CPAN-Meta/issues/25
- # Can't be simply masked due to https://rt.cpan.org/Ticket/Display.html?id=88903
- - perl: 5.10.0_thr_dbg
-
# these run with various dev snapshots - allowed to fail
- perl: devcpan_5.18.1_thr_mb
- perl: bleadperl_thr_mb