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The library already compiled and passed tests, but tooling and dependencies were stale. This brings everything up to current standards without changing public behavior. Library (go 1.23.0): - cmux_test.go: fix 8 `go vet` failures by sending writer-goroutine errors to the existing errCh (now buffered) instead of t.Fatal; ioutil.ReadAll -> io.ReadAll - matchers.go: io/ioutil -> io (io.Discard); gofmt -s doc comment - go.mod: go 1.11 -> 1.23.0; golang.org/x/net -> v0.42.0 (newest release that still permits a 1.23 directive) Example submodule: - golang.org/x/net/context -> stdlib context - grpc v1.27.0 -> v1.80, modern protobuf; helloworld now comes from the separate google.golang.org/grpc/examples module (requires go 1.25, isolated to this demo-only module) CI: - remove ancient .travis.yml (Go 1.6-1.8) - add .github/workflows/ci.yml: gofmt/vet/build/test -race for the library (Go 1.23 + 1.24 matrix) and the example Temporary() methods and TLS version defaults are intentionally unchanged: net.Error still requires Temporary(), and the TLS defaults are public-API behavior. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>