Man pages matching name locale::recodedata::dec_mcs in section 3pm:

Locale::RecodeData::DEC_MCS.3pm.en	debian 10 / libintl-perl
Locale::RecodeData::DEC_MCS.3pm.en	debian 11 / libintl-perl
Locale::RecodeData::DEC_MCS.3pm.en	debian 12 / libintl-perl