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4grayandClaude Opus 5
a2b168127f
Codex P2 on #1364, same class as the 127.0.0.0/8 one. `http://[::]/ch/1234_` and the IPv4-mapped loopback forms slipped past the exact-name set and would have been handed to the player as real addresses. Checked how `URL` actually normalizes these rather than guessing at the spelling a portal might use: brackets are kept, `[0:0:0:0:0:0:0:1]` collapses to `[::1]`, and an IPv4-mapped address is rewritten to hex — `[::ffff:127.0.0.1]` arrives as `[::ffff:7f00:1]`. The guard now strips the brackets, matches `::1` and `::`, and decodes the mapped form by its high byte, so the whole of the mapped 127.0.0.0/8 range is covered along with the mapped unspecified address. The dotted tail is still accepted for any engine that leaves it alone. Routable hosts are unaffected, pinned by tests for `[2001:db8::1]` and `[::ffff:203.0.113.7]`. Mutation-checked: dropping `::` and the mapped-IPv4 decode fails five tests and nothing else. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>