+3. Implement the octonion simple EJA.
+
+4. Factor out the unit-norm basis (and operator symmetry) tests once
+ all of the algebras pass.
+
+5. Override inner_product(), _max_test_case_size(), et cetera in
+ DirectSumEJA.
+
+6. Switch to QQ in *all* algebras for _charpoly_coefficients().