Launchpad allows debian sources to be copied to ubuntu PPAs via the API

The package copy related APIs (IArchive.{syncSource, syncSources}) erroneously allow copies of debian sources to ubuntu PPAs.

Example:

{{{
    debian = lp.distributions['debian']
    sid = debian.getSeries(name_or_version='sid')
    source = debian.main_archive.getPublishedSources(
        source_name='a2ps', distro_series=sid, exact_match=True)[0]
    lp.me.archive.syncSource(
        from_archive=debian.main_archive, source_name='a2ps',
        to_pocket='Release', version='1:4.14-1')
}}}

The copies will never be published and do not block anything, although they trigger PPA publication on every single publishing cycle.