Apple provides sample code for compressing a single file here, but the "aa" command and Finder cannot decompress these files. I needed to write a custom decompresser using Apple's sample code here. Apple provides sample code for creating an "aar" file for directories here and a single string here, and the aa command and Finder can deal with these. However, I have struggled creating an ".aar" file for a single file. The file could be quite large, so reading it into memory and writing it as a blob is not an option. Does anyone have suggestions or can point me to Apple documentation that can create a ".aar" file for a single file?

After updating to visionOS 26.4, I went to Safari's Feature Flags page to reenable Website environment, and I found the Website environment switch had been moved from the top and into the list of switches below. In its place is "Immersive API". I could not find any documentation on this. Anyone know what it is for or can point me to documentation?

Apple's new Spatial Personas use Gaussian Splatting, but I have not found any APIs for visionOS to display a Gaussian Splat like a PLY file. Am I just missing the Apple documentation? If not, are there common practices developers are using for displaying Gaussian Splats in visionOS?

After I updated to visionOS 26.4, I noticed my website environment would suddenly turn off occasionally while I was watching YouTube in Safari. My M2 AVP was still warm after the update. Is turning off a website environment expected behavior when the headset gets warm (e.g., perhaps to reduce load)? If not, anyone have an idea this might happen?

I am seeing kmutil being executed a *lot* on my iMac with Big Sur. Apple's documentation says kmutil is used for loading and unloading kexts (and some other things). Should I be concerned with this much kmutil activity?