There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.

NAME

Catmandu::Fix::issn - normalize the issn value for a given key

SYNOPSIS

# Normalize the ISSN value of issn_field.
# e.g. issn_field => '1553667x'

issn(issn_field) # issn_field => '1553-667X'

SEE ALSO

Catmandu::Fix