[true, false, null]
[1, 2, 3, null]
["Test string", "", null]
Chain(Map(Range(5), {A: it, B: "A" & ToText(it)}), [null])
[CastDate("1/1/2021"), null]

// REVIEW: Short-term fix to unblock user requests.
// with g is to serialize as null. Need long-term decision on how to handle g.
[ CastGen(1729), 2.718, "foo", CastDate("07/20/1969"), { A: "bar" }, ("fizz", "buzz"), [CastGen("baz"), 3.14]]
[ { A: 3, B: CastGen(true) }, { A: 4, B: "hi" } ]
