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Some missing tests:
1) g/./s^@^@	- okay: NULs in commands
2) g/./s/^@/	- okay: NULs in patterns
3) ed -x 	- verify: 8-bit clean
4) ed		- verify: long-line support
5) ed		- verify: interactive/help mode
6) G/pat/	- verify: global interactive command
7) V/pat/	- verify: global interactive command