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Idempotency
Send an Idempotency-Key with every ask. A retry returns the same turn and never buys a second answer.
One turn per key#
Send Idempotency-Key on every ask (the SDKs do). The key derives the turn: a retry — or a parallel duplicate — finds that turn and waits for it; it never runs a second turn or a second charge. The same key with a different body is idempotency_mismatch.