Function list_users 

async fn list_users(
    services: State,
    params: &ListParams<'_>,
) -> (Vec<UserMinorDetails>, Option<String>, UInt)

Returns the filtered, name-ordered and paginated user page, the next_token (present only while the page does not reach the end of the filtered set) and the filtered total. order_by beyond name is not backed by stored fields, so the name ordering (reversed for dir=b) is the only one applied.