Apple Lossless & automatic mono/stereo detection?

Apple lossless is supposed to have auto detection when it comes to mono or stereo. Unlike AAC, there is no option to choose. However, when I rip older mono music in lossless and look at a file summary of the track by entering command i, it is indicating stereo. Is this problem? I would think that a mono file that has been changed to stereo would be larger than necessary and have more noise.

Just as a footnote to your original question :
There are two slightly different uses of the word 'mono' - one for analogue, the other for digital.
In the analogue world, recording engineers use a single track to create a mono recording, then mix it to two identical tracks so it comes out of both speakers
In the digital world, mono means using only a single channel so that files are only half the size - a player (e.g. minidisc) would then output the single track to both channels
As your old mono CDs are in effect 2-track mono (as a mono vinyl album would be also), Apple Lossless simply detects this and thinks of it as 'stereo', not being sophisticated or clever enough to analyse both channels and see they are the same. It would need that information to be encoded into the CD's digital footprint, and I don't believe that it is.

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