view .arcconfig @ 50321:14b57943ae6d stable

rust: fix thread cap (for real this time)

Both e2f8ed37201c and c52435820bbd failed to put a *default* ceiling on
the number of threads used by Rayon to prevent a contention issue.

Calling `rayon::available_parallelism()` creates the global threadpool,
which made our whole dance useless last time.

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