func main():
	>> t := {"one"=1, "two"=2}
	= {"one"=1, "two"=2}

	>> t["one"]
	= 1?
	>> t["two"]
	= 2?
	>> t["???"]
	= none:Int
	>> t["one"]!
	= 1
	>> t["???"] or -1
	= -1

	t_str := ""
	for k,v in t:
		t_str ++= "($k=$v)"
	>> t_str
	= "(one=1)(two=2)"

	>> t.length
	= 2
	>> t.fallback
	= none : {Text,Int}

	>> t.keys
	= ["one", "two"]
	>> t.values
	= [1, 2]

	>> t2 := {"three"=3; fallback=t}
	= {"three"=3; fallback={"one"=1, "two"=2}}

	>> t2["one"]
	= 1?
	>> t2["three"]
	= 3?
	>> t2["???"]
	= none:Int

	>> t2.length
	= 1
	>> t2.fallback
	= {"one"=1, "two"=2}?

	t2_str := ""
	for k,v in t2:
		t2_str ++= "($k=$v)"
	>> t2_str
	= "(three=3)"

	>> {i=10*i for i in 5}
	= {1=10, 2=20, 3=30, 4=40, 5=50}
	>> {i=10*i for i in 5 if i mod 2 != 0}
	= {1=10, 3=30, 5=50}
	>> {x=10*x for x in y if x > 1 for y in [3, 4, 5] if y < 5}
	= {2=20, 3=30, 4=40}

	>> t3 := @{1=10, 2=20, 3=30}
	>> t3:remove(3)
	>> t3
	= @{1=10, 2=20}

	do:
		>> plain := {1=10, 2=20, 3=30}
		>> plain[2]!
		= 20
		>> plain[2]!
		= 20
		>> plain[456] or -999
		= -999
		>> plain:has(2)
		= yes
		>> plain:has(456)
		= no

		>> fallback := {4=40; fallback=plain}
		>> fallback:has(1)
		= yes
		>> fallback[1] or -999
		= 10

	do:
		>> t4 := &{"one"= 1}
		>> t4["one"] = 999
		>> t4["two"] = 222
		>> t4
		= &{"one"=999, "two"=222}

	do:
		>> {1=1, 2=2} == {2=2, 1=1}
		= yes
		>> {1=1, 2=2} == {1=1, 2=999}
		= no

		>> {1=1, 2=2} <> {2=2, 1=1}
		= Int32(0)
		>> [{:Int,Int}, {0=0}, {99=99}, {1=1, 2=2, 3=3}, {1=1, 99=99, 3=3}, {1=1, 2=-99, 3=3}, {1=1, 99=-99, 3=4}]:sorted()
		= [{:Int,Int}, {0=0}, {1=1, 2=-99, 3=3}, {1=1, 2=2, 3=3}, {1=1, 99=99, 3=3}, {1=1, 99=-99, 3=4}, {99=99}]

		>> [{:Int}, {1}, {2}, {99}, {0, 3}, {1, 2}, {99}]:sorted()
		= [{:Int}, {0, 3}, {1}, {1, 2}, {2}, {99}, {99}]