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sub p09_group_Util_1 (*@list) {
    my @ret;
...
say '9.2 ', p09_group_Util_2(@data).perl;
# When dumped via .perl, Util_1 is wrapped in [], and Util_2 in ().
# When dumped via .yaml, Util_1 and Util_2 are identical. Bug?

9.1 [["a", "a", "a", "a"], ["b",], ["c", "c"], ["a", "a"], ["d",], ["e
+", "e", "e", "e"]]
9.2 (["a", "a", "a", "a"], ["b",], ["c", "c"], ["a", "a"], ["d",], ["e
+", "e", "e", "e"])