[pull] main from python:main#998
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pull[bot] merged 2 commits intotj-python:mainfrom Apr 27, 2026
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…oop into helpers (GH-149032) No public API change. Lift the per-iteration select/read/write loop out of Popen._communicate (POSIX) into a module-level _communicate_io_posix(), with small _flush_stdin / _make_input_view / _translate_newlines helpers alongside it. Popen._communicate calls the helper and persists the returned input offset for resume-after-timeout. Retire the private Popen._remaining_time method in favor of module-level _deadline_remaining; all call sites (POSIX and Windows) updated. Defensive behavioural deltas: the stdin and stdout/stderr .close() calls in the I/O loop now swallow BrokenPipeError / OSError, matching __exit__ and the no-input path; previously these were bare. Adds test_communicate_timeout_resume_partial_write to cover _input_offset bookkeeping across TimeoutExpired/resume.
…sted (GH-149001) Clarify in the Authentication keys section that the authkey handshake covers Listener/Client (addressable endpoints) only, not the anonymous pipes behind Pipe() and Queue, and that isolation between same-user processes must be arranged at the OS level.
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