bag.to_list: [1, 1, 1, 2, 3, 3, 4]
bag.to_assoc_list: [1 - 3, 2 - 1, 3 - 2, 4 - 1]
bag.count: 7
bag.count_unique: 4
bag.member(4): yes
bag.member(5): no
unsorted_solutions(bag.member/3): [{4, [1, 1, 1, 2, 3, 3]}, {3, [1, 1, 1, 2, 3, 4]}, {3, [1, 1, 1, 2, 3, 4]}, {2, [1, 1, 1, 3, 3, 4]}, {1, [1, 1, 2, 3, 3, 4]}, {1, [1, 1, 2, 3, 3, 4]}, {1, [1, 1, 2, 3, 3, 4]}]
bag.insert_duplicates(5, "foo"): ["foo", "foo", "foo", "foo", "foo"]
bag.insert_duplicates(0, "foo"): []
bag.insert_duplicates(-1, "foo"): "fail"
bag.insert_duplicates(4, "foo"): ["foo", "foo", "foo", "foo", "foo"]