Andres Freund <andres@anarazel.de> writes:
> What is the gain in having these checks? recv functions need to be safe
> against arbitrary input, so a type crosscheck doesn't buy additional
> safety in that regard. Not that a potential attacker couldn't just
> change the content anyways?
You're confusing security issues with user-friendliness issues.
Detecting that you sent the wrong type via an OID mismatch error
is a lot less painful than trying to figure out why you've got
errors along the line of "incorrect binary data format".
regards, tom lane