Bugs with resampling and downscaling method selectors.

Despite the manual stating that "Image Resampling method" controls how zooming above 100 % is handeled, if found it to also have an effect on zoom levels below 100% (most obviously when downsampling is set to "none").
if "resamling method" = "Bilinear" then "area resize" is availabe to choose, even though the manual states it isnt. Selecting it causes "low res previews" to be selected on next open of options dialogue, but it actually seems to be using a different algorithm.
The manual states that "area resize" is supposed to give the most artefact free downscaling, but in practice I find it can give quite strong moiré on some images on some zoom levels. I've concluded that , contrary to what the name implies, "low res preview" is the most high quality downscaler. At least when it comes to artefact freedom. Sharpness is higher on area resize. I guess this is probably a consequence of the mathematical tradeoff between micro-contrast and scaling artefacts. But also I wonder if there is some bug that causes the "area resize" setting not to be applied correctly because of the discrepancy to what the manual states.
The same with "suppress downsampling artefacts": Contrary to the name I found that it gives the most downsampling artefacts of all the downsampling methods (except for "none", which can give more or less artefacts depending on the "resampling method" setting). At least when it comes to moiré and stairstepping artefacts.