"char" quoted in column information schema view

Hi!

In the output below (seen with PostgreSQL 8.1.3 and 8.2.1),
is it intentional that "char" is quoted, or is it a bug?

Welcome to psql 8.1.3, the PostgreSQL interactive terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
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exp=> select distinct data_type from information_schema.columns;
data_type
--------------------------
"char"
ARRAY
abstime
anyarray
bigint
boolean
bytea
character
character varying
date
inet
integer
name
numeric
oid
real
regproc
smallint
text
time without time zone
timestamp with time zone
xid
(22 rows)

Greetings,
Rainer
--
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Rainer J. H. Brandt
Brandt & Brandt Computer GmbH
Email: rjhb(at)bb-c(dot)de
Mobile: +49 172 9593205