SELECT array_to_count('{}'::float[]);
 array_to_count 
----------------
               
(1 row)

SELECT array_to_count('{1,1,5,2,0}'::smallint[]);
 array_to_count 
----------------
              5
(1 row)

SELECT array_to_count('{1,1,5,2,0}'::integer[]);
 array_to_count 
----------------
              5
(1 row)

SELECT array_to_count('{1,1,5,2,0}'::bigint[]);
 array_to_count 
----------------
              5
(1 row)

SELECT array_to_count('{1,1,5,2,0}'::real[]);
 array_to_count 
----------------
              5
(1 row)

SELECT array_to_count('{1,1,5,2,0}'::float[]);
 array_to_count 
----------------
              5
(1 row)

SELECT array_to_count('{NULL}'::float[]);
 array_to_count 
----------------
              0
(1 row)

SELECT array_to_count('{1,1,NULL,2,0}'::float[]);
 array_to_count 
----------------
              4
(1 row)

SELECT array_to_count('{1,1,5,2,0}'::text[]);
 array_to_count 
----------------
              5
(1 row)