code: async def _write(self, path, data, *,
                       flags=None, cas=None, acquire=None, release=None):
          
          if not isinstance(data, bytes):
              raise ValueError("value must be bytes")
          path = "/v1/kv/%s" % path
          response = await self._api.put(
              path,
              params={
                  "flags": flags,
                  "cas": cas,
                  "acquire": acquire,
                  "release": release
              },
              data=data,
              headers={"Content-Type": "application/octet-stream"})
          return response
docs: Sets the key to the given value.
  
          Returns:
              bool: ``True`` on success