def unique_sorted_values_plus_ALL(array):
    """Obtain a sorted array of all unique values in an array, including an additional value of 'ALL' to denote all values.

    Args:
        array (list|pd.Series|np.array): An array of values.

    Returns:
        list: A sorted array of unique values including an additional value of 'ALL'.
    """
    unique = array.unique().tolist()
    unique.sort()
    unique.insert(0, "ALL")
    return unique