**Please copy the following template [here](https://github.com/ReactiveX/RxSwift/issues/new) and fill in the missing fields so we can help you as soon as possible.**

```
*Short description of missing functionality*:

  E.g. I want this library to implement xxx operator.

*Short code example of how you would like to use the API*:

  code goes here

*The reason why I need this functionality*:

  E.g. I was trying to ....

*Code I have right now*:

  code snippet that demonstrates how you've attempted to solve the problem

```
