The CPAN urls with :: doesn't pass syntax check in Python lib

[oej]

The python lib fails to parse the CPAN URLs with two "::" in the name.

DEBUG: Not a valid PURL: pkg:cpan/LWP::UserAgent
ERROR: Invalid purl 'pkg:cpan/LWP::UserAgent' cannot contain a "user:pass@host:port" URL Authority component: ''.

Either the CPAN spec is wrong or the python library ;-)