Interestingly even in your link you can see that most of the money values (subtotal, total_fare, total_charged) are strings but for some reason total_owed is a

Interestingly even in your link you can see that most of the money values (subtotal, total_fare, total_charged) are strings but for some reason total_owed is a float. Presumably someone messed up but it wasn't caught in code review.