internal void SetAllErrorActions(ErrorActions onError)
 {
     OnUndeclaredMapping            = onError;
     OnMultiplyDeclaredMapping      = onError;
     OnUnusedMapping                = onError;
     OnIndeterminantMappingCreation = onError;
     OnIndeterminantMappingUsage    = onError;
 }
 public static IEnumerable <Mapping> VerifyMappings(ErrorActions onError) => VerifyMappings(x => x.SetAllErrorActions(onError));