Fuzz statistics calculations

[lwwmanning]

We should fuzz statistics by computing all possible stats on an array via array.statistics.compute_all(all::<Stat>()) or some such, canonicalizing that array, and then calling compute_statistics on the canonicalized array (one by one).

If the statistic is present in the first set, it should also be present and with equal value in the second set.

[gatesn]

Doesn't that break when you hard-code canonicalize to copy over all stats?

[lwwmanning]

Nah, because compute_statistics bypasses the cached values altogether