Rpc_encodings.SubscribeType of expected input, if any.
type output = Evm_node_lib_dev_encoding.Ethereum_types.Subscription.idType of the value returned by the RPC.
val input_encoding : input Tezos_base.TzPervasives.Data_encoding.tval output_encoding : output Tezos_base.TzPervasives.Data_encoding.t