unset(distinct_id, prop, modifiers, callback) {
        const identifiers = {$distinct_id: distinct_id};
        this._unset({identifiers, prop, modifiers, callback});
    }
people.unset(distinct_id, prop, modifiers, callback)
        ---
        delete a property on an user record in engage

        usage:

            mixpanel.people.unset('bob', 'page_views');

            mixpanel.people.unset('bob', ['page_views', 'last_login']);