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Add support for older redis versions #47

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@@ -95,7 +99,17 @@ async def _acquire(self) -> None:
pipeline = self._backend.pipeline()

async with self._lock:
current_rate = await self._run_pipeline(cache_key, pipeline)
redis_version = await self.redis_version()
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Can we do this earlier? We don't need to query this every time. We only need this once per app.

redis_version = await self.redis_version()

if int(redis_version.split('.')[0]) < 7:
current_rate, *_ = await pipeline.incr(cache_key).execute()
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It feels like you execute a pipeline twice. This might not be safe due to race conditions.

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