The type of the elements in the source sequence.
The type of the discriminator key computed for each element in the source sequence.
Optional
options: DistinctOptions<TSource, TKey>The optional options for adding a key selector and comparer.
An operator that returns an async-iterable that contains only distinct contiguous items.
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Returns an async-iterable sequence that contains only distinct contiguous elements according to the optional keySelector and comparer.