- Follow-on to previous commit, to keep the changes related
  to Epics::BaseService hierarchy constructor in a cohesive
  commit, to make it easier to identify the scope of changes
  for future potential refactors.
- Add metaprogramming conditional logic to account for the
  different potential first argument names.
- Add TODO notes indicating that checking types or method signatures
  in logic is an antipattern, but the root cause is probably
  that inheritance may not be appropriate here.