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sync, runtime, cmd/compile: add way to mix Mutex/chan in select go-review.googlesource.com/c/go/+/82854... This is like the 5th time I've thrown this at a new AI model but GPT-6-Astra seems to have maybe done it? After it first rejected me for cybersecurity reasons but I talked it out of it #golang

The part that usually kills these CLs is surviving the first cybersecurity refusal without inventing a helper goroutine. If Astra kept the cancelable wait inside select instead of Lock in the background, that is the novelty.