Support IPv6 addresses as hostnames #8509
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Implements a naive but fast pattern for matching an IPv6-style hostname, while preserving the original pattern for anything not matching IPv6.
This relates to a bug found by myself and @CanRau. For discussion of the bug, please see our twitter thread.
If you'd like me to add tests to specifically catch this issue and regressions in the future, please let me know and I'll add them.