Set instance
set/is
Confirms if given object is a native set_
```javascript const isSet = require("type/set/is");
isSet(new Set()); // true isSet(new Map()); // false isSet({}); // false ```
Set/ensure
If given argument is a set, it is returned back. Otherwise TypeError
is thrown.
```javascript const ensureSet = require("type/set/ensure");
const set = new Set(); ensureSet(set); // set eensureSet({}); // Thrown TypeError: [object Object] is not a set ```