Mixing 'rel canonical' and 'rel alternate'
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I know they no longer recommend it (for simplification reasons, I believe) but our system automatically adds the canonical tags to pages (we manually add alternate tags for translated pages) and we have not seen any backlash from having the canonical tags in place.
That isn't to say we may not change how our system handles these tags in the future but for now I simply think that Google is saying you can take it or leave it on translated pages. It may be overkill but it isn't hurting anything.