[issue38907] Add IPv6 Dual-Stack control for http.server

[JIanqiu Tao]

JIanqiu Tao <zkonge at outlook.com> added the comment:

"--no-dual-stack" seems to be a better argument name. "--ipv6-only" lead to ambiguity in a IPv4 only environment.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38907>
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