Catmandu::Fix::issn3pm

Normalize the issn value for a given key

Usage

  # Normalize the ISSN value of issn_field.
  # e.g. issn_field => '1553667x'
  issn(issn_field) # issn_field => '1553-667X'

Unchanged in 2 releases since Debian 12 (Bookworm).