savepoint name vs prepared transaction name

Is there any reason, why I can't put quotes around name of savepoint, but I have/can do this for prepare transaction ?

Ie:
SAVEPOINT 'foo'; --- doesn't work
SAVEPOINT foo; --- all grand

PREPARE TRANSACTION 'foo'; --- grand
PREPARE TRANSACTION foo; refuses to work.

It is quite confusing, I feel like some consistency would be nice here.


--
GJ