Postgresql multidimensional arrays cast fail

I do:

SELECT '{{1,2},{3,4}}'::INTEGER[][]

But I get:

{{1,2},{3,4}} INTEGER[]. Somehow the PostgreSQL server does not understand
that is a multidimensional array. So, later if I want to get {1,2} or {3,4},
the field[1] or field[2]. Evem when I try:

field [1:1] I get {{1,2}} and not plain one dimensional integer array {1,2}
which I want. How do I achieve that?



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