psql return codes

Currently, if we issue this command
psql --set ON_ERROR_STOP= -f f.sql

where f.sql has "select * from foo;"
then psql will return 
0    if foo exists
3    if foo does not exist (or other SQL error)

Whereaspsql --set ON_ERROR_STOP= -c "select * from foo;"
returns
0    if foo exists
1    if foo does not exist (or other SQL error)

Is this a minor oversight, or some aspect of design?

--  Simon Riggs              EnterpriseDB   http://www.enterprisedb.com