Man pages matching name parse::binary::fixedformat::variants in section 3pm:

Parse::Binary::FixedFormat::Variants.3pm.en	debian 10 / libparse-binary-perl
Parse::Binary::FixedFormat::Variants.3pm.en	debian 11 / libparse-binary-perl
Parse::Binary::FixedFormat::Variants.3pm.en	debian 12 / libparse-binary-perl