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Is this an ES BigInt value?

Example

```js var isBigInt = require('is-bigint'); assert(!isBigInt(function () {})); assert(!isBigInt(null)); assert(!isBigInt(function* () { yield 42; return Infinity; }); assert(!isBigInt(Symbol('foo')));

assert(isBigInt(1n)); assert(isBigInt(Object(1n))); ```

Tests

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