They are equivalent for iterating so remove the additional function
call.
Pattern identified as outdated by Lennart Regebro's PyCon 2017 talk
"Prehistoric Patterns in Python"
https://www.youtube.com/watch?v=V5-JH23Vk0I
Also refactor our statistics module to be a bit smarter and less
namedtuple happy. The Statistic class had no reason to be a tuple,
I have no clue why I wrote it that way last night.