Arbitrary whitespace restrictions on range types

Jeff, Hackers:

Is there a strong reason why this has to error?

postgres=# select '[,]'::TSTZRANGE
postgres-# ;
 tstzrange
-----------
 (,)
(1 row)

postgres=# select '[, ]'::TSTZRANGE;
ERROR:  invalid input syntax for type timestamp with time zone: " "
LINE 1: select '[, ]'::TSTZRANGE

--Josh

--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com