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We build up maps of both the existing MagicDNS configuration in hosts and the desired MagicDNS configuration, compare the two, and only write out a new one if there are changes. The comparison doesn't need to be perfect, as the occasional false-positive is fine, but this should greatly reduce rewrites of the hosts file. I also changed the hosts updating code to remove the CRLF/LF conversion stuff, and use Fprintf instead of Frintln to let us write those inline. Updates #14428 Signed-off-by: Aaron Klotz <aaron@tailscale.com>