deferrable update expected soon ?

Hi All

Does any one know when postgres will support deferrable update ?

to prevent current error ?

CREATE TABLE test (
col1 INT UNIQUE );

INSERT INTO test values (1);
INSERT INTO test values (2);
INSERT INTO test values (3);

UPDATE test set col1 = col1+1;

ERROR: Cannot insert a duplicate key into unique index test_col1_key

something like:

CREATE TABLE test (
col1 INT UNIQUE DEFERRABLE );

Cheers
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