Be more wary about mixed-case database names and user names. Get

src/bin/pg_dump/common.c

src/bin/pg_dump/pg_backup.h

src/bin/pg_dump/pg_backup_archiver.c

src/bin/pg_dump/pg_dump.c

src/bin/pg_dump/pg_dump.h

src/bin/pg_dump/pg_dumpall.sh