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September 21, 2026 04:07
IPv6 addresses always contain ':'. Reject IPv4 addresses and hostnames before running the IPv6 regular expression. Official benchmark/net/net-is-ip-v6.js is about 27% faster. net-is-ip-v4.js is unchanged. Assisted-by: a closed-source coding agent Signed-off-by: Yagiz Nizipli <yagiz@nizipli.com> Co-authored-by: Yagiz Nizipli <anonrig@users.noreply.github.com>
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #66165 +/- ##
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+ Coverage 90.27% 90.29% +0.02%
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Files 790 790
Lines 271651 272049 +398
Branches 51842 51939 +97
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+ Hits 245228 245658 +430
+ Misses 16928 16889 -39
- Partials 9495 9502 +7
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net.isIPv6()always ran the large IPv6 regular expression, including for IPv4 addresses and hostnames. An IPv6 address always contains:, so reject those strings first.Object /
toStringinputs still go throughRegExp.prototype.testso existing coercion (covered bytest-net-isip.js) is unchanged.This change was implemented with assistance from a closed-source coding agent. I verified the source, official
benchmark/netresults, andtest-net-isip.js/test-net-blocklist.js.Official benches
Three-run medians,
n=1e7:net/net-is-ip-v6.jsnet/net-is-ip-v4.jsTests
test-net-isip.js,test-net-blocklist.js.