+ #
+ # Using the array notation
+ #
+ # str = """
+ # foo[]=a
+ # foo[]=b
+ # foo[]=c"""
+ # str.write_to_file("config4.ini")
+ # # load file
+ # config = new ConfigTree("config4.ini")
+ # print config.to_map.join(":", ",")
+ # assert config["foo.0"] == "a"
+ # assert config["foo.1"] == "b"
+ # assert config["foo.2"] == "c"
+ # assert config.at("foo").values.join(",") == "a,b,c"