 	/// - Parameter enable: Should variables be watched
 	/// - Returns: data to send to compute server
 	func toggleVariableWatch(enable: Bool, contextId: Int?) throws -> Data {
-		return try encoder.encode(ToggleVariables(watch: enable, contextId: contextId))
+		try encoder.encode(ToggleVariables(watch: enable, contextId: contextId))
 	}
 	
 	/// Create the data to close the connection gracefully
 	///
 	/// - Returns: data to send to compute server
 	func close() throws -> Data {
-		return try encoder.encode(GenericCommand(msg: "close", argument: ""))
+		try encoder.encode(GenericCommand(msg: "close", argument: ""))
 	}
 	
 	/// Create the data to request a list of variables and their values

	/// - Parameter deltaOnly: Should it return only changed values, or all values
	/// - Returns: data to send to compute server
	func listVariables(deltaOnly: Bool, contextId: Int?) throws -> Data {
		return try encoder.encode(ListVariableCommand(delta: deltaOnly, contextId: contextId))
	}
	
	/// Create the data to open a connection to the compute server

	///
	/// - Returns: data to send to compute server
	func saveEnvironment() throws -> Data {
		try encoder.encode(GenericCommand(msg: "saveEnv", argument: ""))
	}
	
	/// Create the data to execute a query
