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Avoid enqueueing the same ISeq twice
by a race condition by multiple Ractors. Atmically incrementing body->total_calls may have its own cost, so for now we intentionally leave the unreliable total_calls. So we allow an ISeq to be never pushed when you use multiple Ractors. However, if you enqueue a single ccan node twice, get_from_list loops infinitely. Thus this patch takes care of such a situation.
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