From 5158f27456ca5a7fac14f706e7df8ffd4676789b Mon Sep 17 00:00:00 2001
From: Tetsuharu OHZEKI <saneyuki.s.snyk@gmail.com>
Date: Sat, 2 Jul 2016 06:03:50 +0900
Subject: [PATCH] chore(Subscriber): add comment why Subscriber.destination is
 'PartialObserver<any>' (#1750)

---
 src/Subscriber.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Subscriber.ts b/src/Subscriber.ts
index ce8da494a7..6dfed5555f 100644
--- a/src/Subscriber.ts
+++ b/src/Subscriber.ts
@@ -42,7 +42,7 @@ export class Subscriber<T> extends Subscription implements Observer<T> {
   public syncErrorThrowable: boolean = false;
 
   protected isStopped: boolean = false;
-  protected destination: PartialObserver<any>;
+  protected destination: PartialObserver<any>; // this `any` is the escape hatch to erase extra type param (e.g. R)
 
   /**
    * @param {Observer|function(value: T): void} [destinationOrNext] A partially