Shimano SLX (M7000) and XT (M8000) single cranks are exactly the same as double

I got an M7000 SLX single crankset for my Krampus, and was surprised to see that it has a second set of chainring mounting holes. Did they sell me a double crank instead of the single? I was perplexed and unsure whether I should return the crankset, so I set out to find out the truth.

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