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wire 2026-09-09
stories 16
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$ the-wire · showcase

Go 1.27 unified V5 export data, then reverted

By RepoJournal · Filed · About Go

Alan Donovan Dmitri Shuralyov Nikita Kruglov khr@golang.org Gopher Robot
5 people shipped this
Alan Donovan @adonovan 3 cited Dmitri Shuralyov @dmitshur 3 cited Nikita Kruglov @NIDJEL 1 cited khr@golang.org @randall77 1 cited Gopher Robot @gopherbot

cmd/compile support for unified V5 export data landed and was reverted the same day after breaking the build.

The Go compiler added support for unified V5 export data [1], which reorders method encoding to preserve source order for named types, fixing crashes in applications using objectpath (issue #81188). This is a narrow but important fix for x/tools users. The commit was then reverted [2] because it broke the build, so V5 support will need to land again before Go 1.27. In the interim, cmd/vendor was updated to x/tools 89ed5c3, which includes the V5 decoder [3]; that change stays in place.

Meanwhile, the runtime hardened interface hashing by folding the type into the hash computation [4], preventing intentional collisions where int64(0) and uint64(0) in interfaces previously hashed identically. This addresses a hash-flooding concern (issue #81299). Separately, net/http now populates Request.TLS from HTTP/2 connection state [5], fixing a nil TLS field for requests through TLS proxies and CONNECT requests when the internal HTTP/2 server is called directly.

In the build repo, storage errors are now matched with errors.Is [6], adapting to cloud.google.com/go/storage v1.51.0's wrapped errors, and a regression test was added to cover the affected functionality [7]. Relui now runs with the race detector enabled [8] to catch data races in real workflows.

Action items

References

  1. [1] cmd/compile: support unified V5 export data (method indices) ↗ golang/go
  2. [2] Revert "cmd/compile: support unified V5 export data (method indices)" ↗ golang/go
  3. [3] cmd/vendor: update golang.org/x/tools to 89ed5c3 ↗ golang/go
  4. [4] runtime: fold interface type into hash ↗ golang/go
  5. [5] net/http: populate Request.TLS from HTTP/2 connection state ↗ golang/go
  6. [6] all: match storage errors with errors.Is ↗ golang/build
  7. [7] internal/gcsfs: run TestGCSFS on a subset of a bucket ↗ golang/build
  8. [8] cmd/relui: enable race detector ↗ golang/build

$ ls golang/reviews/ # the step-back reads

the week in review crypto/ssh CheckCert enforces source address the month in review Go compiler hardens binaries, crypto tightens SSH safety
Topics: Go Infrastructure Full archive →

Quick answers

What shipped in Go on September 9, 2026?
cmd/compile support for unified V5 export data landed and was reverted the same day after breaking the build. In total, 16 commits landed.
Who contributed to Go on September 9, 2026?
5 developers shipped this update, including Gopher Robot, Alan Donovan, Nikita Kruglov, khr@golang.org, and Dmitri Shuralyov.
What were the notable Go updates?
cmd/compile: support unified V5 export data (method indices), Revert "cmd/compile: support unified V5 export data (method indices)", and cmd/vendor: update golang.org/x/tools to 89ed5c3.
♥

$ log @golang --recent

Go compiler moves SSA rewrite packages, net QUIC clears reset receive buffer 2 shipped Fast-path receive buffer cleared on stream reset 1 shipped crypto/x509 tightens URI and email name constraint matching 5 shipped crypto/tls frees pinned buffers, compiler tail call DCE fix lands 26 shipped

$ log --all # elsewhere on the wire

@vuejs Compiler-SFC fix restores await scope in nested blocks @vercel Next.js fixes dev startup race as Turborepo layers telemetry and matcher speedups

$ ls showcases/

Rails Django Laravel Node.js Vercel Vue.js Kubernetes HashiCorp Arch Linux Linux Anthropic OpenAI

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