[jonobird1]

Do you mind expanding on why this is important? As @ezfe says below, it's a public key.

[scheub]

It's not because I think it's exploitable in any way (it's not - public keys are public), but because it's a neat feature I found interesting that many people don't know about. It also has potential use cases, like automatically keeping a machine's authorized_keys up to date with members in a team, or skipping having to ask for someone's public key when sharing access.