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* doc/lispref/processes.texi (Accepting Output): * src/process.c (Faccept_process_output): Document better the meaning of the timeout of 'accept-process-output' a,d the fact that it doesn't always return as soon as some output is available. See https://lists.gnu.org/archive/html/emacs-devel/2025-08/msg00750.html for more details.