Rethink skipUntil and takeUntil

[mattpodwysocki]

IxJS version: 2.x

Code to reproduce:

Expected behavior:

Actual behavior:

Additional information:

Current implementations of takeUntil and skipUntil accept Promise values as parameters which is problematic given their eager nature. Instead, we should look into the following overloads which support AsyncIterator as well as () => Promise<any>.

export function skipUntil<T>(
  source: AsyncIterable<T>, 
  other: () => Promise<any>);

export function skipUntil<T>(
  source: AsyncIterable<T>,
  other: AsyncIterable<any>);

export function takeUntil<T>(
  source: AsyncIterable<T>, 
  other: () => Promise<any>);

export function takeUntil<T>(
  source: AsyncIterable<T>,
  other: AsyncIterable<any>);

[OliverJAsh]

I would also suggest adding a takeUntil overload which receives a predicate function, like in RxJava

#7 (comment)
http://reactivex.io/RxJava/javadoc/rx/Observable.html#takeUntil(rx.functions.Func1)

[mattpodwysocki]

Closed as per #75