4.x: Streamable +blockingFirst, last[OrError], skip, Single.flattenAsStreamable

[akarnokd]

Streamable

• blockingFirst
• last
• lastOrError
• skip

ℹ️ Preparing minimal operators for the Shakespeare Plays Scrabble benchmarks.

Single

• flattenAsStreamable

Other

• DisposableOnly to avoid the need to cover a generally never called isDisposable. Operators will be updated later to use it.
• Fix documentation reported by the (updated) validator tests.

[github-actions]

🐷 TruffleHog + Entropy Beauty Scan

Average entropy of changed code: 4.729 bits/char
Verdict: ⚠️ Consider review — entropy outside sweet spot

Changed files entropy:

src/main/java/io/reactivex/rxjava4/core/Completable.java: 4.834
src/main/java/io/reactivex/rxjava4/core/Maybe.java: 4.843
src/main/java/io/reactivex/rxjava4/core/Single.java: 4.831
src/main/java/io/reactivex/rxjava4/core/Streamable.java: 4.653
src/main/java/io/reactivex/rxjava4/internal/disposables/DisposableOnly.java: 4.911
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StageResumable.java: 4.712
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBlocking.java: 4.721
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableLastAsSingle.java: 4.371
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSingleFlattenAs.java: 4.537
src/main/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSkip.java: 4.553
src/test/java/io/reactivex/rxjava4/disposables/DisposableTest.java: 4.614
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBaseTest.java: 4.751
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableBlockingTest.java: 4.930
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableDeferTest.java: 4.822
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableFailingFinish.java: 4.763
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableLastAsSingleTest.java: 4.789
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSingleFlattenAsTest.java: 4.862
src/test/java/io/reactivex/rxjava4/internal/operators/streamable/StreamableSkipTest.java: 4.738
src/test/java/io/reactivex/rxjava4/validators/CheckBaseTypeAnnotationsTest.java: 4.496
src/test/java/io/reactivex/rxjava4/validators/CheckParamValidationTest.java: 4.845

✅ 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 99.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.72%. Comparing base (b6b09c6) to head (99e0849).

Files with missing lines	Patch %	Lines
...ernal/operators/streamable/StreamableBlocking.java	95.23%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                4.x    #8229      +/-   ##
============================================
+ Coverage     98.69%   98.72%   +0.02%     
- Complexity     7097     7117      +20     
============================================
  Files           814      819       +5     
  Lines         50026    50176     +150     
  Branches       6764     6786      +22     
============================================
+ Hits          49373    49535     +162     
+ Misses          452      447       -5     
+ Partials        201      194       -7     

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