--- title: "A native IDE written in Go goes open source" publication: "Go Weekly" issue: 618 published_at: "2026-09-18" canonical_url: "https://golangweekly.com/issues/618" --- Plus a 40ms GC pause caused by swap, faster allocations in Go 1.27, and the races the race detector misses. #​618 — September 18, 2026 [Read the Web Version](https://golangweekly.com/issues/618) Together with [![Master.dev\](https://res.cloudinary.com/cpress/image/upload/c_fill,g_auto,w_1280,h_245/co_white,e_outline:17/cgiteem1q7kgf8yoheqo.png)](https://master.dev/sale/?utm_source=golangweekly&utm_medium=newsletter&utm_campaign=buildersale) Go Weekly [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/pnnbhcamx6v3r9zqepui.jpg)](https://go.dev/blog/size-specialized-allocations) [Size-Specialized Memory Allocation in Go 1.27](https://go.dev/blog/size-specialized-allocations) — Small allocations (under 80 bytes) are now up to 30% faster, and you can get the benefits just by rebuilding. Learn where the speedup comes from and why 80 bytes was the "sweet spot". Allocation-heavy programs could see a ~1% gain overall. Michael Matloob (The Go Blog) [![\](https://res.cloudinary.com/cpress/image/upload/c_limit,w_480,h_480,q_auto/copm/d4b30fb9.png)](https://master.dev/sale/?utm_source=golangweekly&utm_medium=newsletter&utm_campaign=buildersale) [Stay Sharp in the Age of AI](https://master.dev/sale/?utm_source=golangweekly&utm_medium=newsletter&utm_campaign=buildersale) — Master.dev instructors build at Anthropic, OpenAI, Netflix, Google, and Stripe. Learn from them with hundreds of courses, live workshops, and expanded AI learning paths. [New members get $100 off a yearly membership](https://master.dev/sale/?utm_source=golangweekly&utm_medium=newsletter&utm_campaign=buildersale). Master.dev sponsor [Data Races and the Limits of ThreadSanitizer in C and Go](https://theconsensus.dev/p/2026/09/06/data-races-and-the-limits-of-threadsanitizer-in-c-and-go.html) — A tour of how ThreadSanitizer (the engine behind race detection in Go) works, and the easily reachable limits where it stops catching real races. Two objects in unrelated `sync.Pool`s colliding in Go's 128-slot table is enough to hide a race. Phil Eaton **IN BRIEF:** - The [proposal for cgo without a C toolchain](https://github.com/golang/go/issues/81450) from last week's issue is progressing, with [a CL adding a `GOEXPERIMENT`](https://go.dev/cl/832864) to trial it ahead of any approval. - The first bare-bones [draft Go 1.28 release notes](https://tip.golang.org/doc/go1.28) are available to skim, ahead of the expected February 2027 release. - 🔒 The Rust team has put out [an alert to maintainers of popular libraries](https://blog.rust-lang.org/2026/09/17/targeted-attacks/) saying there's an 'ongoing campaign' targeting them in order to compromise their systems. Go is not immune to this, so stay alert. - 🇪🇺 [GopherCon Europe 2027](https://gophercon.eu/) has been announced for Berlin next June 14–17. - 🇮🇹 [GoLab 2026](https://golab.io/) takes place in Bologna, Italy on November 1–3. [A 40ms Go GC Pause Caused by Swap](https://frn.sh/go-gc/) — _“I’m writing this so you don’t slap your forehead like I almost did when I decided to run swap in production to absorb memory spikes.”_ Fernando Simões [Scaling Go in CI by Replacing `actions/setup-go`](https://www.cloudx.ai/posts/setup-go) — How GitHub's official `actions/setup-go` lets parallel jobs interfere with each other's caches, and why its cache goes stale until you touch `go.mod`. CloudX's alternative gives each CI job its own isolated cache. Schwab and Downs (CloudX) [CodeAF: A New Open-Source Software Factory, Written in Go](https://agentfield.ai/github/codeaf/?utm_source=golang&utm_medium=newsletter&utm_campaign=golang-260918&utm_id=golang-260918-codeaf&utm_content=codeaf) — You direct the work from one window for every project. It splits, runs, tests and merges, and asks only when it must. AgentField.ai sponsor 📄 [A Million Go Map Entries Take 38MB, Not 16MB](https://dev.to/nazar-boyko/a-million-go-map-entries-take-38mb-not-16mb-2ij3) – A look at where the extra bytes go in Go’s Swiss table map implementation and why `map[T]struct{}` no longer saves memory over `map[T]bool`. Nazar Boyko ▶️ [Numbers: The Long History Behind Go's Untyped Constants](https://www.youtube.com/watch?v=tiqLk5V1W_c) – A history-heavy talk on how 1960s word sizes gave C its integer literal mess, and why you’ll never see `0x80ULL` in Go code. Dave Cheney ▶️ [Building a Web App with Go and HTMX](https://www.youtube.com/watch?v=lZ4EPkIngRc) Haseeb Majid 🛠 Code & Tools [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60,q_auto/lgpl6n6xo3pcicgxmwjr.jpg)](https://rune.build/blog/rune-is-now-open-source) [Rune: A Fast, Native, Open Source IDE Built in Go](https://rune.build/blog/rune-is-now-open-source) — A GPU-accelerated IDE ([shown off here](https://rune.build/)) that’s now GPLv3 licensed. This post has interesting details on how they got their integrated terminal almost as fast as Alacritty and Ghostty without using cgo for the hot path. [GitHub repo](https://github.com/unstablebuild/rune). Ernest Romero Climent 💡 Rune is also an interesting case study for using (a fork of) [Ebitengine](https://ebitengine.org/) for its GPU-powered rendering. [golang-set 3.0: A Simple, Well-Tested, Generic Set Type](https://github.com/deckarep/golang-set) — While a future Go release [_might_](https://github.com/golang/go/issues/80590) be adding [a generic set type](https://speakerdeck.com/ramalho/sets-in-go), this is a mature option for now. [v3.0](https://github.com/deckarep/golang-set/releases/tag/v3.0.0) improves performance, adds [Filter](https://github.com/deckarep/golang-set/pull/175) and [AppendFrom](https://github.com/deckarep/golang-set/pull/178) methods, and removes Mongo BSON support. Ralph Caraveo [wasm2go: Translate WebAssembly Binaries into Go Code](https://github.com/goccy/wasm2go) — A compiler to translate WASM binaries into a standalone Go package, so you can ship, say, a C library built with the WASI SDK inside a Go app without the added weight of a WASM engine. Masaaki Goshima 💡 If 'wasm2go' sounds familiar, there's also [`ncruces/wasm2go`](https://github.com/ncruces/wasm2go) which powers the cgo-free [go-sqlite3](https://github.com/ncruces/go-sqlite3). The key difference is `ncruces/wasm2go` emits pure Go, while `goccy`'s also generates amd64 and arm64 assembly. [GoHT: Haml, Slim and EGO Template Engine for Go](https://goht.dev/) — Write templates alongside normal Go code. Use `@haml`, `@slim`, or `@ego` blocks in a `.goht` file, then run the generator to produce HTML-rendering Go functions. Michael Stack 📰 Classifieds [Software Engineer](https://jobs.ashbyhq.com/stickermule/6db27241-e2d4-4f35-a2c4-b58d84621843?utm_source=Cooperpress) - Join our "kick ass" team! Our software team operates from 17 countries and we're looking for more exceptional engineers to join our team. --- 🐘 Since many Go backends end up talking to Postgres, you may also like our sibling newsletter: [Postgres Weekly](https://postgresweekly.com/). - [str2duration 2.2](https://github.com/xhit/go-str2duration) – Get a `time.Duration` from a string like `1h` or `1w2d3s`. - [html2text 1.5](https://github.com/k3a/html2text) – Convert HTML to plain text with no dependencies. - [Goldmark 2.1](https://github.com/yuin/goldmark) – Popular Markdown parser and rendering library. - ✉️ [enmime 2.5](https://github.com/jhillyerd/enmime) – MIME mail encoding and decoding package. - [gRPC-Go 1.84.0](https://github.com/grpc/grpc-go/releases/tag/v1.84.0) – High perf gRPC framework. - [go-diff 0.9](https://github.com/sourcegraph/go-diff) – `diff` parser and printing library. Curated by Peter Cooper and [Glenn Goodrich](https://twitter.com/ruprict). Go is a [trademark of Google](https://go.dev/brand). The [Go gopher](https://go.dev/blog/gopher), whenever used, is an original creation by Renée French. [Change your email](https://golangweekly.com/edit_subscription/*|UID|*) [Stop getting this newsletter](https://golangweekly.com/leave/*|UID|*) © Cooper Press Ltd · Fairfield Enterprise Centre, Louth, LN11 0LS, United Kingdom