Facter 4 outputs hypervisors.zone.id fact differently on Solaris

Running puppet facts diff on Solaris 11 gives the following output:

        "hypervisors.zone.id": {

          "new_value": "0",

          "old_value": 0

        },

Facter 4 reports a string, while Facter 3 reports an integer.

Facter 4: https://github.com/puppetlabs/facter/blob/main/lib/facter/resolvers/solaris/zone.rb#L35
Facter 3: https://github.com/puppetlabs/facter/blob/3.x/lib/src/facts/resolvers/zone_resolver.cc#L44

Again, this can be an issue with how Facter represents integers, as Facter 3 saves a string value but outputs an integer.