Subject: | Subroutines::ProtectPrivateSubs and Encode::_utf8_off |
POSIX subroutines starting with underscore are not raising Subroutines::ProtectPrivateSubs warning.
I suggest add more exceptions: Encode::_utf8_off / Encode::_utf8_on
those subroutines are danger, but they are part of public API (documented),
thus not really private.