QUERY: SELECT 'char 16 string'::char16 = 'char 16 string '::char16 AS false;
false
-----
f    
(1 row)

QUERY: SELECT 'c'::char = 'c'::char AS true;
true
----
t   
(1 row)

QUERY: SELECT 'this is a text string'::text = 'this is a text string'::text AS true;
true
----
t   
(1 row)

QUERY: SELECT 'this is a text string'::text = 'this is a text strin'::text AS false;
false
-----
f    
(1 row)