[HACKERS] Question about STRICT

[Gevik Babakhani]

Could someone please clarify the difference between "RETURNS NULL ON 
NULL INPUT" or "STRICT" when creating a function. Do both options exist 
because of historical reasons/SQL standard compliance?

Shouldn't we raise an error when calling a function with NULL arguments 
values if the function is created as STRICT?
(This would of course have an impact on checking for NULLs on arguments 
defaults if the above is implemented.)

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Regards,
Gevik