Short description of the issue:

Currently, the recommended way of extending the library is to use Observable.create() (https://github.com/ReactiveX/RxSwift/blob/master/Documentation/GettingStarted.md#custom-operators). However, this is only possible for the simplest cases.
More complex cases, will require us to understand the implementation details and copy Producer and Sink.

It c

Are you submitting a bug report or a feature request?

Neither, reporting missing documentation

What is the current behavior?

Detailed documentation on the signature of mutator functions is missing.

What is the expected behavior?

I'd expect the docs on mutators to be more elaborate on both the definition and the usage of mutators. I've looked at the docs for react

https://www.w3.org/TR/resize-observer-1/

I love this library so much. I'm just having some trouble with the below use case..

I have a few 100vh components that can be swapped in and out. Each has a different animation. I'd like to have the animation begin at the start of a 100vh height component and end at the bottom of the 100vh component, instead of at the start and bottom of the page.

Is it possible to start and end the scroll a