uuid: `NewV7()` always generates a UUID with `7000` on browsers

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▲ 58 points • 7 comments • by mfrw • 3d ago • HN discussion ↗

Pangram verdict · v3.3

We believe that this document is fully human-written

0 %

AI likelihood · overall

Human

100% human-written 0% AI-generated

SEGMENTS · HUMAN 2 of 2

SEGMENTS · AI 0 of 2

WORD COUNT 151

PEAK AI % 0% · §1

Analyzed

Jun 22

backend: pangram/v3.3

Segments scanned

2 windows

avg 76 words each

Distribution

100 / 0%

human / AI fraction

Verdict

Human

Pangram v3.3

Article text · 151 words · 2 segments analyzed

Human AI-generated

§1 Human · 0%

Go version go version go1.27rc1 darwin/arm64 Output of go env in your module/workspace: AR='ar' CC='clang' CGO_CFLAGS='-O2 -g' CGO_CPPFLAGS='' CGO_CXXFLAGS='-O2 -g' CGO_ENABLED='1' CGO_FFLAGS='-O2 -g' CGO_LDFLAGS='-O2 -g' CXX='clang++' GCCGO='gccgo' GO111MODULE='' GOARCH='arm64' GOARM64='v8.0' GOAUTH='netrc' GOBIN='/Users/hajimehoshi/go/bin' GOCACHE='/Users/hajimehoshi/Library/Caches/go-build' GOCACHEPROG='' GODEBUG='' GOENV='/Users/hajimehoshi/Library/Application Support/go/env' GOEXE='' GOEXPERIMENT='' GOFIPS140='off' GOFLAGS='' GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/cj/73zbb35j0qx5t4b6rnqq0__h0000gn/T/go-build1757681747=/tmp/go-build -gno-record-gcc-switches -fno-common' GOHOSTARCH='arm64' GOHOSTOS='darwin' GOINSECURE='' GOMOD='/Users/hajimehoshi/test/uuidv7/go.mod' GOMODCACHE='/Users/hajimehoshi/go/pkg/mod' GONOPROXY='' GONOSUMDB='' GOOS='darwin' GOPACKAGESDRIVER='' GOPATH='/Users/hajimehoshi/go' GOPRIVATE='' GOPROXY='https://proxy.golang.org,direct'

§2 Human · 0%

GOROOT='/Users/hajimehoshi/sdk/go1.27rc1' GOSUMDB='sum.golang.org' GOTELEMETRY='on' GOTELEMETRYDIR='/Users/hajimehoshi/Library/Application Support/go/telemetry' GOTMPDIR='' GOTOOLCHAIN='auto' GOTOOLDIR='/Users/hajimehoshi/sdk/go1.27rc1/pkg/tool/darwin_arm64' GOVCS='' GOVERSION='go1.27rc1' GOWORK='' PKG_CONFIG='pkg-config' What did you do?

Make this program

package main

import "uuid"

func main() { println(uuid.NewV7().String()) }

Run this for js/wasm target (I tested GOOS=js GOARCH=wasm go1.27rc1 run main.go, which generates outputs to the console if you have node and go_js_wasm_exec in PATH)

What did you see happen? The output always includ 7000 part

019ee60f-29b3-7000-a12b-f817e25db8f4 019ee610-29c7-7000-bc34-f04bc09150bb 019ee610-2eb4-7000-884a-dfcad78e47d9

What did you expect to see? The 000 part should include random bytes (This issue was discovered by @mimifuwacc (https://x.com/mimifuwacc/status/2068357756609065444))