bernardladenthin / streambuffer / 26082394488

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Preserve thread interrupt flag when wrapping InterruptedException (#71)

* Preserve thread interrupt flag when wrapping InterruptedException

When read() / read(byte[],int,int) catch an InterruptedException from
tryWaitForEnoughBytes and rethrow it wrapped in IOException, restore the
thread's interrupt flag so callers up the stack can still observe the
interruption. Addresses SonarQube rule java:S2142.

* Use AtomicBoolean instead of boolean[1] in interrupt-flag tests

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Co-authored-by: Claude <noreply@anthropic.com>

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