redux-observable/redux-observable

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**Do you want to request a *feature* or report a *bug*?**  

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**What is the current behavior?**


**If the current behavior is a bug, please provide the steps to reproduce and a minimal demo of the problem using JSBin, StackBlitz, or similar.**

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**What is the expected behavior?**


**Which versions of redux-observable, and which browser and OS are affected by this issue? Did this work in previous versions of redux-observable?**