How to pass a table type with an array field to a function in postgresql

Question

i have a table called book

CREATE TABLE book
(
  id smallint NOT NULL DEFAULT 0,       
  bname text,       
  btype text,
  bprices numeric(11,2)[],
  CONSTRAINT key PRIMARY KEY (id )
)

and a function save_book

CREATE OR REPLACE FUNCTION save_book(thebook book)
  RETURNS text AS
$BODY$
DECLARE 
myoutput text :='Nothing has occured';
BEGIN

    update book set 
    bname=thebook.bname,
    btype=thebook.btype,bprices=thebook.bprices  WHERE id=thebook.id;

    IF FOUND THEN
        myoutput:= 'Record with PK[' || thebook.id || '] successfully updated';
        RETURN myoutput;
    END IF;

    BEGIN
        INSERT INTO book values(thebook.id,thebook.bname,thebook.btype,
        thebook.bprices);
        myoutput:= 'Record successfully added';           
    END;
 RETURN myoutput;

    END;
$BODY$
  LANGUAGE plpgsql VOLATILE
  COST 100;

now when i call the function

SELECT save_book('(179,the art of war,fiction,{190,220})'::book);

i get the error

ERROR: malformed array literal: "{190"
SQL state: 22P02
Character: 18

i dont understand because i dont see any error in the format of the array, any help?