4.x: Streamable + takeWhile, + fromXXX, + toObservable + ~.toStreamble

[akarnokd]

New operators:

• Streamable.toObservable
• Streamable.takeWhile
• Streamable.fromCompletable
• Streamable.fromMaybe
• Streamable.fromSingle
• Completable.toStreamable
• Maybe.toStreamable
• Single.toStreamable

Cleanup

• Organize imports
• Move Streamable.forEach code into StreamableForEach utility record

Marbles:

Completable

Maybe

Single

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.611 bits/char
Verdict: ✅ Mid-4 beauty detected (thoughtful human code!)

Changed files entropy:

src/main/java/io/reactivex/rxjava4/core/Streamable.java: 4.620
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFromPublisher.java: 4.568
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableIntervalRange.java: 4.363
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTimer.java: 4.557
src/test/java/io/reactivex/rxjava4/core/RxJavaTest.java: 4.547
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBaseTest.java: 4.795
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFromPublisherTest.java: 4.498
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableIntervalRangeTest.java: 4.761
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTimerTest.java: 4.642
src/test/java/io/reactivex/rxjava4/internal/schedulers/SharedSchedulerIsolatedTest.java: 4.837
src/test/java/io/reactivex/rxjava4/testsupport/TestHelper.java: 4.335
src/test/java/io/reactivex/rxjava4/validators/CheckParamValidationTest.java: 4.803

✅ No secrets or suspicious high-entropy strings found.

Mid-4 beauty heuristic in action — powered by our entropy chats! 😊

[codecov]

Codecov Report

❌ Patch coverage is 99.46809% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.67%. Comparing base (a318f0c) to head (c9891bf).

Files with missing lines	Patch %	Lines
...ternal/operators/streamable/StreamableForEach.java	97.05%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8214      +/-   ##
============================================
- Coverage     98.69%   98.67%   -0.02%     
- Complexity     6923     6953      +30     
============================================
  Files           793      799       +6     
  Lines         49022    49174     +152     
  Branches       6628     6646      +18     
============================================
+ Hits          48380    48524     +144     
- Misses          450      457       +7     
- Partials        192      193       +1     

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