deferrable foreign keys - Mailing list pgsql-general

Hi,

are there downsides of making foreign keys deferrable (but initially
immediate) for updates, when the transaction does not set the
constraint behaviour to deferred?

I'd expect that to have the same behaviour as non deferrable foreign
keys.
What I don't understand is, why is non deferrable the default, then.

So maybe I miss something.

regards
    Morus