one null value in array isnt allowed???

Hi,

Updating an array field with one null value isnt possible:

UPDATE table SET integer_array = ARRAY[NULL]

But those queries are working:

UPDATE table SET integer_array = ARRAY[NULL,1]
UPDATE table SET integer_array = ARRAY[1,NULL]

This dosent seems logical to me.
Is it a bug?

Thanks for helping,
atu

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