minor V8 updates are broken

[targos]

$ git node v8 --v8-dir ~/git/chromium/v8/v8 minor
✔ Update local V8 clone
❯ Minor V8 update
  ✔ Get current V8 version
  ✔ Get latest V8 version
  ✖ The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an
    instance of ChildProcess
◼ Commit V8 update
✖ The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received an instance of ChildProcess