A converter turns cell text into the declared parameter type

All 4 scenarios hold

Yes and No become booleans, for a primitive and a boxed parameter alike.

expected outcome broken scenario
ScenariobooleanBooleanConverted value as text?
AffirmativeYesYestrue
NegativeNoNofalse
Case is ignoredyESyEStrue
Unrecognised wordmaybemaybefalse