This functions is only intended to be used with gitlab API v3. With v4, the global iid is no longer functional.
gl_to_issue_id(issue_id, project, force_api_v3 = TRUE, ...)
projectwide issue id (as seen by e.g. gitlab website users)
project name or id
Since this function is no longer necessary for Gitlab API v4, this must be set to TRUE in order to avoid deprecation warning and HTTP error. It currently default to TRUE, but this will change with gitlabr 1.0.
passed on to gitlab