Users on GitLab [Ultimate](https://about.gitlab.com/pricing/) will additionally see
the `epic_iid` property:
```json
{
"project_id":4,
"description":"Omnis vero earum sunt corporis dolor et placeat.",
"epic_iid":42,
...
}
```
**Note**: `assignee` column is deprecated, now we show it as a single-sized array `assignees` to conform to the GitLab EE API.
**Note**: The `closed_by` attribute was [introduced in GitLab 10.6][ce-17042]. This value will only be present for issues which were closed after GitLab 10.6 and when the user account that closed the issue still exists.