Highlighting API consistency improvements

RxJS 7 also ships with a fix of some weird behavior in the library. Let's consider the example of a concat operator:

"Concat: Creates an output observable, which sequentially emits all values from the first given observable and then moves on to the next."

Let's consider the following sample:

    concat(
    of(1).pipe(
      tap(() => console.log('tap 1')),
      delay(100),
      finalize(() => console.log('Finalize 1'))
      ),
    of(2).pipe(
      tap(() => console.log('tap 2')),
      delay(100),
      finalize(() => console.log('Finalize 2'))
      )
 ...