[OisinMoran]

Is it actually just doing it at both ends or something nore complex? Because for example if I did 7 - (-1~2)^2 the actual range would be 3-7 but just doing both ends of the interval would give 3-6 as the function is maximised inside the range.

[kqr]

Oh, maybe it's performing more complicated interval arithmetic. I had no idea. That's kind of cool!