While we might never be able to have 100% of our code strict, we can at
the very least do it for all of our tests. This ensures that our tests
are using our API with the types as intended by the test author, and not
silently be cast to what our API requires.
* Defined names/formulae in ODS are prefixed by $$ when used in a formula; so we need to strip this out to fully convert them to an Excel formula
* Test for ODS Writer for DefinedNames