ECHO: "--- empty"
ECHO: []
ECHO: []
ECHO: []
ECHO: []
ECHO: "--- single elements"
ECHO: [undef]
ECHO: [true]
ECHO: [3]
ECHO: ["abc"]
ECHO: [[0 : 1 : 10]]
ECHO: "--- single vectors"
ECHO: [1, 2, 3]
ECHO: [[1, 2, 3]]
ECHO: [[[1, 2, 3]]]
ECHO: [[[1, 2, [3, 4], 5]]]
ECHO: "--- multiple elements"
ECHO: [3, 3]
ECHO: [1, 2, 3]
ECHO: [1, 2, 3, 4, 5]
ECHO: [1, "text", false, [1 : 0.5 : 3]]
ECHO: "--- vector / element"
ECHO: [3, 4, undef]
ECHO: [3, 4, 5, 6]
ECHO: [3, 4, 5, 6, true]
ECHO: [3, 4, "5", 6, "test"]
ECHO: [3, 4, true, 6, [4 : 1 : 3]]
ECHO: "--- element / vector"
ECHO: [3]
ECHO: [3, 3, 4]
ECHO: [true, 3, [4]]
ECHO: ["9", 1, 2, 3]
ECHO: [[6 : 2 : 9], 3, [4]]
ECHO: "--- vector / vector"
ECHO: [3, 4]
ECHO: [[], 3, 4]
ECHO: [[2, 4], 3, 4]
ECHO: [5, 6, "d", [3, 4]]
ECHO: [[1, 0, 0], [2, 0, 0], 3, 0, 0]
ECHO: [[1, 0, 0], [2, 0, 0], [3, 0, 0]]
ECHO: [[1, 0, 0], [2, 0, 0], [3, 0, 0], [4, 4, 4], [5, 5, 5]]
ECHO: "--- recursive function"
ECHO: [[1, 1], [2, 4], [3, 9], [4, 16], [5, 25], [6, 36], [7, 49], [8, 64], [9, 81], [10, 100]]