The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/9.6/static/app-pgrestore.html
Description:
Using pg_restore with the --clean flag without the --if-exists flag and
objects are not present in the destination database results in exit status
1. The documentation states that --if-exists suppresses "some harmless error
messages" but it also changes the exit status to 0. A non-zero exit status
does not seem to be harmless.