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> it should ask if you want to add the new key to the known hosts

But how do you know it's the right key?

By comparing the fingerprint to a trusted source, which the snippet above doesn't do. And if you trust that the https source will lead you to the correct github, you can trivially check the fingerprint against what github publishes.

You’d be pressed to find someone who doesn’t trust the https source. So… you’d do manually what the snippet does?

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