Creates an empty Set.
The created Set is a plain LinkedHashSet. As such, it considers elements that are equal (using operator ==) to be indistinguishable, and requires them to have a compatible Object.hashCode implementation.
The set is equivalent to one created by new LinkedHashSet<E>()
.
factory Set() = LinkedHashSet<E>;
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https://api.dart.dev/stable/2.5.0/dart-core/Set/Set.html