thrice
Established
With high refractive index glass, the lens can usually gather more light that the actual diameter of the aperture would indicate. So, they may have calculated the light transmission rather than simply measuring the max aperture diameter as 45.45mm. This would account for the larger DOF than people were expecting.
So perhaps it has f-stop of f/1.2+ but t-stop of f/1.1
So perhaps it has f-stop of f/1.2+ but t-stop of f/1.1