Proposal floats hostbased SSH auth for x/crypto/ssh

A proposal lands to add RFC 4252 hostbased authentication to golang.org/x/crypto/ssh on both client and server sides, filling a long-standing gap for anyone who needs to authenticate the calling host rather than the user. On the performance side, a write-up measures how much amd64 microarchitecture levels actually buy a Go binary, given the compiler still defaults to an instruction set pushing twenty years old. The numbers are more modest than the GOAMD64 marketing might suggest. Elsewhere the subreddit is relitigating whether Go is losing its way after a Prime video, which is about as on-brand for a Tuesday as it gets.