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Here is a good explanation of a sensor filter array that does not have a anti-aliasing function:
Non-low-pass filters explained: Goodbye to anti-aliasing? | TechRadar
Non-low-pass filters explained: Goodbye to anti-aliasing? | TechRadar
. . . The benefit of leaving off the filter is that the camera is able to record a little more detail and produce slightly sharper images, with less need for post-capture sharpening. . .
. . . Rather than simply omitting the anti-aliasing filter when building a digital camera, manufacturers have to use a filter that doesn't have the normal anti-aliasing properties, but still retains the ability to block infrared light, for example. So a new filter design is required. . .