4.x: Streamable optimizations 2026.07.21

[akarnokd]

• Streamable.skip optimization + fusion support
• Streamable.take optimization + fusion support
• Marker interfaces for the Streamable
• DisposableStreamerCancellation adjustments, blockingXXX external cancellation support.

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.739 bits/char
Verdict: ⚠️ Consider review — entropy outside sweet spot

Changed files entropy:

src/jmh/java/io/reactivex/rxjava4/streamable/StreamableSkipPerf.java: 4.813
src/main/java/io/reactivex/rxjava4/core/Streamable.java: 4.646
src/main/java/io/reactivex/rxjava4/disposables/DisposableStreamerCancellation.java: 4.770
src/main/java/io/reactivex/rxjava4/internal/disposables/NeverDisposableStreamerCancellation.java: 4.773
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/IsEnumerableStreamable.java: 4.978
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/IsIndexableStreamable.java: 4.979
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/IsSynchronousStreamable.java: 5.008
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBlocking.java: 4.580
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableEmpty.java: 4.809
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableJust.java: 4.676
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableRange.java: 4.580
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableRangeLong.java: 4.541
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSkip.java: 4.364
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTake.java: 4.562
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/DisposableStreamerCancellationTest.java: 4.867
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBlockingLastTest.java: 4.913
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSkipTest.java: 4.727
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTakeTest.java: 4.708

✅ No secrets or suspicious high-entropy strings found.

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

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.749 bits/char
Verdict: ⚠️ Consider review — entropy outside sweet spot

Changed files entropy:

src/jmh/java/io/reactivex/rxjava4/streamable/StreamableSkipPerf.java: 4.813
src/main/java/io/reactivex/rxjava4/core/Streamable.java: 4.647
src/main/java/io/reactivex/rxjava4/disposables/DisposableStreamerCancellation.java: 4.770
src/main/java/io/reactivex/rxjava4/internal/disposables/NeverDisposableStreamerCancellation.java: 4.773
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/IsEnumerableStreamable.java: 4.978
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/IsIndexableStreamable.java: 4.979
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/IsSynchronousStreamable.java: 5.008
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBlocking.java: 4.580
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableEmpty.java: 4.809
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableJust.java: 4.676
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableRange.java: 4.580
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableRangeLong.java: 4.541
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSkip.java: 4.364
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTake.java: 4.562
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/DisposableStreamerCancellationTest.java: 4.867
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBlockingLastTest.java: 4.913
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFromStreamTest.java: 4.836
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSkipTest.java: 4.727
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableTakeTest.java: 4.708
src/test/java/io/reactivex/rxjava4/validators/CheckParamValidationTest.java: 4.846

✅ 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 97.27273% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.59%. Comparing base (db01b1f) to head (b7ac3ae).
⚠️ Report is 1 commits behind head on 4.x.

Files with missing lines	Patch %	Lines
.../internal/operators/streamable/StreamableSkip.java	94.73%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8254      +/-   ##
============================================
- Coverage     98.62%   98.59%   -0.04%     
- Complexity     7129     7145      +16     
============================================
  Files           822      824       +2     
  Lines         50690    50768      +78     
  Branches       6892     6905      +13     
============================================
+ Hits          49993    50053      +60     
- Misses          477      487      +10     
- Partials        220      228       +8     

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