Provide support for PostgreSQL sequences including nextval() default value

I’m using PostgreSQL 9.2 with the system supported sequences as primary keys for several tables.  When I run a Liquibase update on these tables it generates the following warning:

INFO 9/3/13 2:32 PM:liquibase: Unknown default value: value ‘nextval(‘tns_hb_seq’::regclass)’ type serial (4), assuming it is a function

These messages are logged even though these tables are not being altered by the changeset. Unfortunately this is confusing to our users as this is an INFO level message.

It would be nice if Liquibase recognized the nextval() function or at least changed this to a DEBUG level message. 

The ddl that generates the above error looks like:

CREATE TABLE tnsheartbeat
(
  id integer NOT NULL DEFAULT nextval(‘tns_hb_seq’::regclass),
  lastsenttime timestamp without time zone,
  originaltime timestamp without time zone,
  receivetime timestamp without time zone,
  CONSTRAINT tnsheartbeat_pkey PRIMARY KEY (id)
)
WITH (
  OIDS=FALSE
);

and the sequence is created with:
CREATE SEQUENCE ntdm.tns_hb_seq
    START WITH 1
    INCREMENT BY 1
    NO MINVALUE
    NO MAXVALUE
    CACHE 1
    CYCLE;

Is that with liquibase 3.0.x? Or a 2.x version?

Nathan