How reject works?

Lets say I listen to some push event and for some reason I decide to reject this push. I tried to do something like:

```
repos.on("push", (data: PushData) => {
    data.reject(403, `Rejected! Have a good day`)
});
```

It really returns some error to the client, But it doesn't return the specific message I chose (It does send the correct code)

What am I doing wrong?