2 0) g/./s^@^@ - okay: NULs in commands
3 1) g/./s/^@/ - okay: NULs in patterns
6 . - okay: embedded newlines in insert mode
7 3) ed -x - verify: 8-bit clean
8 4) ed - verify: long-line support
9 5) ed - verify: interactive/help mode
10 6) G/pat/ - verify: global interactive command
11 7) V/pat/ - verify: global interactive command