REQ messages should be in the following format:

["REQ", <subscription_id>, <filters1>, <filters2>, ...]

However this library incorrectly serializes REQ messages like this:

["REQ", <subscription_id>, [<filters1>, <filters2>, ...]]

Source: https://github.com/nostr-protocol/nips/blob/master/01.md#from-relay-to-client-sending-events-and-notices