Interesting, thanks for sharing. This would definitely agree w/ the fare rules. But joepubli seems to have had better results by asking? Obviously MH or QR would have been in the rule, so as it updates, I wonder if their system looks at the current rules when determining (since the code would stay the same)?

It's not clear how they handle rule versioning - once a ticket is issued and the fare rules change do the new ones then apply? Where do they even store the old rules?