Subscriber does not need to reference Observable; Observable weakly refs Subscriber

Author: domfarolino

spec.bs

@@ -188,9 +188,6 @@ Each {{Subscriber}} has a <dfn for=Subscriber>subscription controller</dfn>, whi
 
 Each {{Subscriber}} has a <dfn for=Subscriber>active</dfn> boolean, initially true.
 
-Each {{Subscriber}} has an <dfn for=Subscriber>owning Observable</dfn>, an {{Observable}}, which is
-initialized during construction.
-
 Note: This is a bookkeeping variable to ensure that a {{Subscriber}} never calls any of the
 callbacks it owns after it has been [=close a subscription|closed=].
 
@@ -311,8 +308,6 @@ observable.subscribe({}, {signal: outerController.signal});
 
     1. Set |subscriber|'s [=Subscriber/active=] boolean to false.
 
-    1. Set [=this=]'s [=Subscriber/owning Observable=]'s [=Observable/active subscriber=] to null.
-
     1. [=AbortSignal/Signal abort=] |subscriber|'s [=Subscriber/subscription controller=] with
        |reason|, if it is given.
 
@@ -416,7 +411,7 @@ interface Observable {
 Each {{Observable}} has a <dfn for=Observable>subscribe callback</dfn>, which is a
 {{SubscribeCallback}} or a set of steps that take in a {{Subscriber}}.
 
-Each {{Observable}} has a <dfn for=Observable>active subscriber</dfn>, which is a
+Each {{Observable}} has a <dfn for=Observable>weak subscriber</dfn>, which is a weak reference to a
 {{Subscriber}}-or-null, initially null.
 
 Note: The "union" of these types is to support both {{Observable}}s created by JavaScript (that are
@@ -744,10 +739,10 @@ An <dfn>internal observer</dfn> is a [=struct=] with the following [=struct/item
        error algorithm=], or an algorithm that [=invokes=] the provided
        {{SubscriptionObserver/error}} [=callback function=].
 
-    1. If [=this=]'s [=Observable/active subscriber=] is not null and [=this=]'s [=Observable/active
+    1. If [=this=]'s [=Observable/weak subscriber=] is not null and [=this=]'s [=Observable/weak
        subscriber=]'s [=Subscriber/active=] is true:
 
-       1. Let |subscriber| be [=this=]'s [=Observable/active subscriber=].
+       1. Let |subscriber| be [=this=]'s [=Observable/weak subscriber=].
 
        1. [=set/Append=] |internal observer| to |subscriber|'s [=Subscriber/internal observers=].
 
@@ -771,12 +766,11 @@ An <dfn>internal observer</dfn> is a [=struct=] with the following [=struct/item
 
        1. Return.
 
-    1. Let |subscriber| be a [=new=] {{Subscriber}}, initialized with [=Subscriber/owning
-       Observable=] as [=this=].
+    1. Let |subscriber| be a [=new=] {{Subscriber}}.
 
     1. [=set/Append=] |internal observer| to |subscriber|'s [=Subscriber/internal observers=].
 
-    1. Set [=this=]'s [=Observable/active subscriber=] to |subscriber|.
+    1. Set [=this=]'s [=Observable/weak subscriber=] to |subscriber|.
 
     1. If |options|'s {{SubscribeOptions/signal}} [=map/exists=], then: