Allow n suffix for BigInt to match JavaScript

Open

#372 opened on May 23, 2019 1 comment 3 reactions 0 assignees View on GitHub

Description

Would allow you to write
```dart
final biggie = 9007199254740991n;
```

instead of
```dart
final biggie = BigInt.from(9007199254740991);
```

See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/BigInt

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