{Flowable,Observable}.collect(Collector) contravariant on T

[cardamon]

Added ? super twice. Would resolve #7032.

[akarnokd]

Compilation errors:

> Task :compileJava /home/travis/build/ReactiveX/RxJava/src/main/java/io/reactivex/rxjava3/core/Flowable.java:19807: error: cannot infer type arguments for FlowableCollectWithCollectorSingle<> return RxJavaPlugins.onAssembly(new FlowableCollectWithCollectorSingle<>(this, collector)); ^ reason: inferred type does not conform to equality constraint(s) inferred: CAP#1 equality constraints(s): CAP#1,T where T is a type-variable: T extends Object declared in class Flowable where CAP#1 is a fresh type-variable: CAP#1 extends Object super: T from capture of ? super T /home/travis/build/ReactiveX/RxJava/src/main/java/io/reactivex/rxjava3/core/Observable.java:16647: error: cannot infer type arguments for ObservableCollectWithCollectorSingle<> return RxJavaPlugins.onAssembly(new ObservableCollectWithCollectorSingle<>(this, collector)); ^ reason: inferred type does not conform to equality constraint(s) inferred: CAP#1 equality constraints(s): CAP#1,T where T is a type-variable: T extends Object declared in class Observable where CAP#1 is a fresh type-variable: CAP#1 extends Object super: T from capture of ? super T 2 errors 

[cardamon]

Hehe I thought I would get away with not even compiling the sources

[codecov]

Codecov Report

Merging #7033 into 3.x will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@ Coverage Diff @@ ## 3.x #7033 +/- ## ============================================ - Coverage 99.53% 99.47% -0.06%  + Complexity 6670 6669 -1  ============================================ Files 742 742 Lines 47270 47270 Branches 6373 6373 ============================================ - Hits 47048 47022 -26  - Misses 102 112 +10  - Partials 120 136 +16 

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/io/reactivex/rxjava3/core/Flowable.java	100.00% <ø> (ø)	595.00 <0.00> (ø)
...ain/java/io/reactivex/rxjava3/core/Observable.java	100.00% <ø> (ø)	565.00 <0.00> (ø)
...a3/internal/jdk8/FlowableCollectWithCollector.java	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
...ernal/jdk8/FlowableCollectWithCollectorSingle.java	100.00% <100.00%> (ø)	3.00 <1.00> (ø)
.../internal/jdk8/ObservableCollectWithCollector.java	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
...nal/jdk8/ObservableCollectWithCollectorSingle.java	100.00% <100.00%> (ø)	3.00 <1.00> (ø)
...tivex/rxjava3/internal/jdk8/ParallelCollector.java	89.90% <0.00%> (-6.43%)	2.00% <0.00%> (ø%)
.../operators/observable/ObservableFlatMapSingle.java	94.44% <0.00%> (-3.18%)	2.00% <0.00%> (ø%)
...l/operators/observable/ObservableFlatMapMaybe.java	89.43% <0.00%> (-2.82%)	2.00% <0.00%> (ø%)
...a3/internal/subscribers/InnerQueuedSubscriber.java	97.72% <0.00%> (-2.28%)	16.00% <0.00%> (-1.00%)
... and 13 more

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