TST: Add subclass related tests

These are complicated, and modifications could probably be allowed
here.  The complexities arise not just from the assymetric behaviour
of Python binary operators, but also because we additionally have
our own logic for deferring sometimes (for arrays).
That is, we may coerce the other object to an array when it is
an "unknown" object.

This may assume that subclasses of our scalars are always valid
"arrays" already (so they never need to be coerced explicitly).
That should be a sound assumption, I think?

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