perl/ESLIF.xs: ::keep, ::printf and ::pack dev+ [ci skip]
perl/ESLIF.xs: ::keep, ::printf and ::pack dev+ [ci skip]

jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF,jddurand/c-marpaESLIF