Many thanks… this came up as we’re working on getting Puppet facter detecting stream correctly (https://github.com/puppetlabs/facter/pull/2291 https://github.com/puppetlabs/facter/pull/2291)
Wow, this will break a lot of puppet modules out there....
E.g. https://github.com/puppetlabs/facter/pull/2291#issuecomment-790039719
~pete