Go 1.27 Can Now Find Leaked Goroutines — Go 1.27 added a goroutineleak profile that spots goroutines permanently blocked on channels or sync primitives, even in production. It piggybacks on the GC's reachability tracing and is quite precise. Unusually for a Go feature, this began life as an academic paper (of which Vlad was lead author) from Aarhus, WashU, and Uber.

Vlad Saioc

TinyGo 0.42: recover Works, and Go Can Now Boot Your PC — A big one for the Go compiler for microcontrollers and WebAssembly, which can now recover from runtime panics (like nil dereferences) as standard Go does. Go 1.27 support also arrives and, curiously, a UEFI target (in early form) so Go code can run before the OS does.

The TinyGo Team

IN BRIEF:

• Go 1.27.1 and 1.26.8 have been released with fixes for cgo, the compiler, and several packages. No security updates.

• 🤖 Russ Cox says frontier LLMs are "much better and dramatically faster" than he is at finding and fixing Go bugs, and shares the agent transcripts to prove it. (He also mentions he's no longer at Google.)

• The long effort to move HTTP/2 natively into net/http has been marked "And done" by Damien Neil, with x/net/http2 headed for deprecation.

How Swiss Tables Work in Go’s Built-in Map — If you've wondered what happens when you write m[key] = value in Go, this illustrated tour of the new (as of 1.24) Swiss Table implementation is fantastic. It also covers 1.27's mapsplitgroup experiment that separates keys from values in memory.

Phuong Le (VictoriaMetrics)

📊 The New Go JSON API: Twice As Fast, or 1.5x Slower? — A quick benchmark of Go 1.27's JSON packages, including encoding/json/v2. Unmarshalling is faster with v2, but Daniel finds marshalling a slice of typed structs is 1.5x slower, counter to the performance claims in the release notes.

Daniel Lemire

• AWS Lambda for Go 1.55 – AWS's official library for writing Lambda functions in Go improves Go 1.27 compatibility and now requires Go 1.26+.

• GoReleaser 2.18 – The release automation tool adds preflight checks and release summaries in GitHub Actions.

• quic-go 0.62 – Pure Go QUIC and HTTP/3 implementation, now with RFC 9218 stream priorities.

• Miniredis 2.39 – Pure Go Redis server for unit tests, now with GEOSEARCH and hash field TTLs.

• 🤖 MCP-Go 1.0 – Go implementation of the Model Context Protocol (MCP).

• Notify 1.6 – One API for sending notifications to numerous services.

• fq 0.18 – Decode and query binary files with a jq-style language.

• bluetooth 0.16 – Bluetooth Low Energy API for Go and TinyGo.