pg_get_serial_sequence is inconsistent

pg_get_serial_sequence() does dequoting/downcasing on its relation-name
argument, but not on its column-name argument.

regression=# create table "FOO" ("Ff1" serial);
NOTICE: CREATE TABLE will create implicit sequence "FOO_Ff1_seq" for serial column "FOO.Ff1"
CREATE TABLE
regression=# select pg_get_serial_sequence('FOO','Ff1');
ERROR: column "Ff1" of relation "foo" does not exist
regression=# select pg_get_serial_sequence('"FOO"','Ff1');
pg_get_serial_sequence
------------------------
public."FOO_Ff1_seq"
(1 row)

regression=# select pg_get_serial_sequence('"FOO"','"Ff1"');
ERROR: column ""Ff1"" of relation "FOO" does not exist
regression=#

This seems pretty inconsistent. I was expecting to find that it broke
pg_dump, as well, but it looks like pg_dump is expecting exactly
this behavior.

Should we change it? We need the quote-aware behavior for the relation
name (because that could be schema-qualified) so the choices seem to be
status quo or add dequoting/downcasing to the column name argument.

regards, tom lane