RebindableAA!(immutable int[string]) aa = ["a": 1, "b": 2]; // works
assert(aa["a"] == 1); // cool aa = ["a": 3, "b": 4]; // nice auto bb = aa; // yes bb = ["a": 4, "b": 5]; // super
aa["a"] = 2; // error, good
aa.remove("a"); // error, very good
