Function safe

packages/arctic/src/session/index.ts:338–341

(value: number)

        ? (input.usage.inputTokens ?? 0)
        : (input.usage.inputTokens ?? 0) - cachedInputTokens
      const safe = (value: number) => {
        if (!Number.isFinite(value)) return 0
        return value
      }

      const tokens = {
        input: safe(adjustedInputTokens),