> Because that's how recursive AA works; instead of blindly supersampling
> everything within a pixel's area, the algorithm attempts to find edges
> and only use the samples that are needed to better define those edges,
> while interpolating the rest.

The doc says:
"If the resulting colors differ more than the threshold amount additional
samples will be taken."
If it's really "more", only four samples per pixel would be taken. But as
more samples are taken, the meaning is "at least", so it should reach the
maximum number of subdivisions and samples.

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