Decompressing iTune files to Aifs - How much loss of quality, if any?

In the bottom corner of iTunes, there's a Burn Disk button. It then takes your AAC or MP3 files and restores them to aif files to burn a standard audio CD of the playlist.
My question is this: Does the restoration process completely restore the aif to its original pristine CD quality, or is the restored aif file poorer quality than the one the MP3 or AAC file was originally made from, and if so, by how much?
iBook G4, iPod 60GB   Mac OS X (10.4.8)  

Does the restoration process completely restore the aif to its original pristine CD quality, or is the restored aif file poorer quality than the one the MP3 or AAC file was originally made from,
Neither. It should be identical to the MP3/AAC you are converting from.

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