Commits on Sep 9, 2020

1. fix(router): Ensure routes are processed in priority order and only i… …

   …f needed
   
   There is a slight difference between `map`...`concatAll` and `concatMap`
   in that the latter (`concatMap`) will ensure that the computations are
   executed in-order and only if needed while the former may execute the
   `map` body of all items if they do not emit immediately. That is, if the stream
   is
   `from([a, b, c]).pipe(map(v => of(v).pipe(delay(1))), concatAll(), first())`
   the `map` body will execute for all of `a`, `b`, and `c`.
   However, the following will only execute the `concatMap` body for `a`
   `from([a, b, c]).pipe(concatMap(v => of(v).pipe(delay(1))), first())`
   
   See https://stackblitz.com/edit/rxjs-cvwxyx
   
   fixes angular#38691

   

   atscott committed Sep 9, 2020
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