UI scale to integer sizes to match 2018.2's pixel perfect camera?

I've gotten the pixel perfect camera script in 2018.2 to work, but on certain aspect-ratios or resolutions, my camera game area appears a lot smaller than the size of the screen with black bars around the edge to keep the pixels perfect. Is there a way of enforcing pixel perfection on the UI as well? Otherwise the UI resizes to match the screen size with a tiny game area in the middle of the screen on non-integer divisible screen sizes.

 

Thanks for that! So, it looks okay with some elements, but for instance, grid layout seems to be stretching very oddly with constant pixel size. Does constant pixel size have to be used in the custom scaler for the pixel-perfection to work? Do other elements in the canvas have to be set up in a specific way?

 

Does this custom scaler work on all of the settings or does it have to use constant pixel size?