Or, in terms of what we might call the 'Jerry idea'*, a systematic study showing that local Ia SNe are not, phenomenologically, different from distant ones (assuming an appropriate LCDM model).

*Summarised, in language consistent with Jerry posts, as something like "high-z SNe are all radically different from low-z ones!" or "none of the observational results makes any sense at all!" Or, if you prefer, anti-confirmation bias on steroids.