Timestamp docs weirdness

What does this in the date/time type docs mean?

zulu, allballs, z    time    00:00:00.00 UTC

Cos it has bizarro behaviour:

In 7.3.4:

australia=# select 'zulu'::time;
ERROR:  Bad time external representation 'zulu'
australia=# select 'allballs'::time;   time
---------- 00:00:00
(1 row)

australia=# select 'z'::time;
ERROR:  Bad time external representation 'z'
australia=# select 'zulu, allballs, z'::time;
ERROR:  Bad time external representation 'zulu, allballs, z'
australia=#

Virtually identical behaviour in 7.4b4.

What in the heck is 'zulu', 'allballs' or 'z'???

Chris