Remove explicit null and type checks in `BuiltSetMultimap`/`SetMultimapBuilder`.

google / built_collection.dart

Immutable Dart collections via the builder pattern.

https://pub.dev/packages/built_collection

BSD 3-Clause "New" or "Revised" License

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Closed davidmorgan closed 3 years ago

davidmorgan commented 3 years ago

Rely on language checks instead. This allows a BuiltSetMultimap<K?, V?> to contain nulls.