code: public LazyArray optJSONArray(String key) throws LazyException{
  		LazyNode token=getOptionalFieldToken(key);
  		if(token==null)return null;
  		if(token.type==LazyNode.VALUE_NULL)return null;
  		if(token.type!=LazyNode.ARRAY)return null;
  		LazyArray arr=new LazyArray(token);
  		arr.parent=this;
  		return arr;
  	}
docs: Returns the JSON array stored in this object for the given key or null if the key doesn't exist.
  
  @param key the name of the field on this object
  @return an array value or null if the key doesn't exist
  @throws LazyException if the value for the given key was not an array.