On 4th of January 2024, Tom Lane committed patch:
In plpgsql, allow %TYPE and %ROWTYPE to be followed by array decoration. This provides the useful ability to declare a variable that is an array of the type of some other variable or some table column. Quan Zongliang, Pavel Stehule Discussion: https://postgr.es/m/ec4523e1-9e7e-f3ef-f9ce-bafd680ad6f6@yeah.net