Auto DROP SEQUENCE?

Hi PostgreSQL people,

	I was wondering; I have noticed that sequences are not dropped
automatically if they are used by a table. That's okay; I bet somebody has a
good reason why this is so. However, when sequences are created implicitly
by somebody using the SERIAL data type, does it not make sense to drop that
sequence when the table is dropped?
	I'm just throwing the question out. :)

Thanks,

	Daryl.