uuid.UUID is implemented as [16]byte, like most other UUID implementations out there. If you want to keep your package implementation agnostic, use [16]byte as

uuid.UUID is implemented as [16]byte, like most other UUID implementations out there. If you want to keep your package implementation agnostic, use [16]byte as argument type; that's assignment-compatible with any other type that is such an array underneath: For an example, see the UUID logging of golog: https://pkg.go.dev/github.com/domonda/golog#Message.UUID https://pkg.go.dev/github.com/domonda/golog#Message.UUID