Just when you think USB-C cables can't get more confusing...

The USB-C cable that comes with the new MacBook Pro, to connect it to its charger, doesn't not function as a USB-C - USB-C 3.x data cable. It does however function as a USB 2 data cable confused

It of course looks like every other USB-C to USB-C cable.
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Remind me to change my signature to something more interesting someday