Sets

[giann]

| A set acts almost completely like a list except that values are unique
$[int] mySet = $[1, 2, 3];

mySet.append(1); | does nothing
mySet.append(4); | appends new value

[giann]

This would be syntax sugar over:

{str, void} set = {
    "hello": void,
    "world": void,
};