Is it possible to get the before-change-values in UPDATE-RETURNING-clause ?

I want to do an UPDATE, which affects many comlumns and for some columns I wan`t to know if they had really changed.
For this I want to use the RETRUNING-clause of UPDATE. But it seems I can only get the values after the update , not before the update. ( like :old.foo in row-level-triggers ) Is there any solution ?

If you want to know if a value changed, you can use:
if :old.column = :new.column then ....

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Ok, I lost half a day on this (novice problem), but I arranjed a solution that resolve the problem totally. There is the code:
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Is it possible to get the before-change-values in UPDATE-RETURNING-clause ?

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