5. Factor out the unit-norm basis (and operator symmetry) tests once
all of the algebras pass.
-6. Refactor the current ungodly fast charpoly hack (relies on the
- theory to ensure that the charpolys are equal.)
+6. Override inner_product(), _max_test_case_size(), et cetera in
+ DirectSumEJA.
+
+7. Switch to QQ in *all* algebras for _charpoly_coefficients().