Rx Challenge #10: DistinctUntilChanged with expiration period
This challenge is DistinctUntilChanged cancellation after a period.
When having event stream which may produce items in a row and then be idle for a period.
You may want to get item after a period even those it identical the the previous one.
On challenge you need to construct it using composition of existing Rx’s operators.
It can be formulate into the following pattern:
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