Dart Package: Immutable lists, sets, maps, and multimaps, which are as fast as their native mutable counterparts. Extension methods and comparators for native Dart collections.
BSD 2-Clause "Simplified" License
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`averageBy`'s documentation code is that of `sumBy` #44
https://pub.dev/documentation/fast_immutable_collections/latest/fast_immutable_collections/FicIterableExtension/averageBy.html