Pretty print objects

[ghost]

Projects like Deno and Hermes can print Set objects in a useful representation:

$ deno
> new Set([10, 20])
Set { 10, 20 }

$ hermes-repl
>> new Set([10, 20])
Set { 10, 20 }

However XST output is of limited usefulness:

$ cat one.js
const e1 = new Set([10, 20]);
print(e1);

$ xst -s one.js
[object Set]