wrong inicializied array in plpgsql

Hello

I am testing long array values. I tryed write simple function in plpgsql
for this. I found maybe a bug. Array in plpgsql without explicit init
(empty array) don't work;

CREATE OR REPLACE FUNCTION foo1() RETURNS FLOAT AS '
DECLARE f FLOAT [];
BEGIN
  f[1] := 10.0;
  RETURN f[1];
END' LANGUAGE plpgsql;

cyril=> select foo1();
 foo1
------


(1 row)

CREATE OR REPLACE FUNCTION foo2() RETURNS FLOAT AS '
DECLARE f FLOAT [] DEFAULT ''{}'';
BEGIN
  f[1] := 10.0;
  RETURN f[1];
END' LANGUAGE plpgsql;

cyril=> select foo2();
 foo2
------
   10
(1 row)


regards
Pavel Stehule