Enum values not rendered in ${COMPLETION-CANDIDATES} for collection types

[remkop]

Example that reproduce the issue:

public class EnumTest {

    @Option(names = "-list", description = "Multiple days. Valid values: ${COMPLETION-CANDIDATES}")
    List<DayOfWeek> daysOfWeek;

    @Option(names = "-single", description = "Single day. Valid values: ${COMPLETION-CANDIDATES}")
    DayOfWeek dayOfWeek;

    public static void main(String[] args) {
        new CommandLine(new EnumTest()).usage(System.out);
    }
}

Actual output:

Usage: <main class> [-single=<dayOfWeek>] [-list=<daysOfWeek>]...
      -list=<daysOfWeek>    Multiple days. Valid values:
      -single=<dayOfWeek>   Single day. Valid values: MONDAY, TUESDAY, WEDNESDAY,
                              THURSDAY, FRIDAY, SATURDAY, SUNDAY

Expected output:
The -list option should also display the enum values.