SHOW, RESET require quotes, SET doesn't

SHOW and RESET require quoting in cases where SET doesn't:

test=> SHOW plperl.use_strict;
ERROR: syntax error at or near "." at character 12
LINE 1: SHOW plperl.use_strict;
^
test=> SHOW "plperl.use_strict";
plperl.use_strict
-------------------
on
(1 row)

test=> SET plperl.use_strict TO off;
SET
test=> RESET plperl.use_strict;
ERROR: syntax error at or near "." at character 13
LINE 1: RESET plperl.use_strict;
^
test=> RESET "plperl.use_strict";
RESET

I see in gram.y that SHOW and RESET take a ColId but SET takes a
var_name, which is ColId or var_name.ColId. Is there a reason for
the inconsistency or is it just an oversight?

--
Michael Fuhr