Man pages matching name mouse::meta::attribute::custom::trait::string in section 3pm:

Mouse::Meta::Attribute::Custom::Trait::String.3pm.en	debian 10 / libmousex-nativetraits-perl
Mouse::Meta::Attribute::Custom::Trait::String.3pm.en	debian 11 / libmousex-nativetraits-perl
Mouse::Meta::Attribute::Custom::Trait::String.3pm.en	debian 12 / libmousex-nativetraits-perl