use official/portable Multithreading.max_threads_value, which is also subject to user preferences (NB: Thread.numProcessors is apt to lead to surprises like very high numbers for systems with hyperthreading);
use official/portable Multithreading.max_threads_value, which is also subject to user preferences (NB: Thread.numProcessors is apt to lead to surprises like very high numbers for systems with hyperthreading);

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