Go accepts dropping manual sticky-bit dance on BSD and Solaris

The accepted proposal is a small but satisfying bit of housekeeping: Go will stop manually setting the sticky bit on file creation on BSD and Solaris, since open(2) and mkdir(2) already refuse to carry it across. Elsewhere, adonovan floats iter.Seq Every and Some methods to spare everyone the same five-line predicate loop, and there is a nicely concrete write-up on signing TLS handshakes with a key that never leaves the TPM, including what it actually costs per handshake.