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Is this value a JS Set? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

Example

```js var isSet = require('is-set'); assert(!isSet(function () {})); assert(!isSet(null)); assert(!isSet(function* () { yield 42; return Infinity; }); assert(!isSet(Symbol('foo'))); assert(!isSet(1n)); assert(!isSet(Object(1n)));

assert(!isSet(new Map())); assert(!isSet(new WeakSet())); assert(!isSet(new WeakMap()));

assert(isSet(new Set()));

class MySet extends Set {} assert(isSet(new MySet())); ```

Tests

Simply clone the repo, npm install, and run npm test