Single observables

[aerabi]

RxJava has different observable types based on the number of elements they emit. One of them is Single which contains only one element.

Having a specific observable type for Single can improve readability of the code. Also, one can support specific operators for it that are not available for normal observables.

[tmair]

I think this suggestion has already come up here #6340

[voliva]

Yep, there's a very interesting talk from @cartant and @kolodny about it from the 2020's london rxjs.live: https://www.youtube.com/watch?v=vC1KXMo97XI