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This makes a second independent copy of an existing ssh_key, for situations where one piece of code is going to want to keep it after its current owner frees it. In order to have it work on an arbitrary ssh_key, whether public-only or a full public+private key pair, I've had to add an ssh_key query method to ask whether a private key is known. I'm surprised I haven't found a need for that before! But I suppose in most situations in an SSH client you statically know which kind of key you're dealing with.