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It was very informative.
Specially for developers it is the sandboxing parts, and the ARC/GC issues.
In that case I'll bookmark it so I have something to read the next time my train is canceled (which sadly is more often than you'd think)
It was good, but not really indepth enough for me.
Does filevault use the AES extention of modern CPUs?
Do you have to enter the encryption password on resume?
When does no sparse file support in hfs- really matter?
Those are just a few questions I had reading it.
There are ARS articles that answered all my questions, those are the very good ones.