Every workflow here declares on: push: and on: pull_request: with no branch filter, so a branch that has a pull request open runs the whole matrix twice: once for the push that updated the branch, once for the pull request.
What was measured, 2026-09-18
Seen on excelano/slipcase-open#15, where a two-file change touching no code produced six runs for three workflows — the same commit under two events, twice each. This repository's affected workflows are apple-silicon.yml, ci.yml and windows.yml.
What it costs
The macOS runner bills at ten times a Linux minute and the Windows one at two, and a macOS job that builds, clippies and runs a suite is not cheap. Every pull request pays for it twice, and a branch pushed five times pays for it ten.
What closes it
The filter the rest of the fleet already uses. duckling and segler both declare:
on:
push:
branches: [main]
pull_request:
branches: [main]A push to a branch that is not main then fires nothing, the pull request event covers the branch, and main is still built on merge. The release and workflow_dispatch triggers are unaffected.
Found on excelano/slipcase-open#15 while merging something else, and this repository is in the same shape.
Every workflow here declares
on: push:andon: pull_request:with no branch filter, so a branch that has a pull request open runs the whole matrix twice: once for the push that updated the branch, once for the pull request.What was measured, 2026-09-18
Seen on excelano/slipcase-open#15, where a two-file change touching no code produced six runs for three workflows — the same commit under two events, twice each. This repository's affected workflows are
apple-silicon.yml, ci.yml and windows.yml.What it costs
The macOS runner bills at ten times a Linux minute and the Windows one at two, and a macOS job that builds, clippies and runs a suite is not cheap. Every pull request pays for it twice, and a branch pushed five times pays for it ten.
What closes it
The filter the rest of the fleet already uses. duckling and segler both declare:
A push to a branch that is not main then fires nothing, the pull request event covers the branch, and main is still built on merge. The
releaseandworkflow_dispatchtriggers are unaffected.Found on excelano/slipcase-open#15 while merging something else, and this repository is in the same shape.