From 289e7cd75153bc2587799b6019af0da961017919 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E2=80=9CNaeel=E2=80=9D?= <tazet@narod.ru>
Date: Sat, 30 May 2026 15:31:37 +0300
Subject: [PATCH] fix: overlaps() canonical formula (a.start<=b.end &&
 b.start<=a.end)

---
 src/validators.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/validators.js b/src/validators.js
index 67fc8d4..7411919 100644
--- a/src/validators.js
+++ b/src/validators.js
@@ -85,8 +85,8 @@ function validate(input) {
 function overlaps(cidr1, cidr2) {
   const a = cidrToRange(cidr1);
   const b = cidrToRange(cidr2);
-  return a.start <= b.end && b.start <= a.start ||
-         b.start <= a.end && a.start <= b.start;
+  // Каноническая формула пересечения двух отрезков: [a.start, a.end] ∩ [b.start, b.end] ≠ ∅
+  return a.start <= b.end && b.start <= a.end;
 }
 
 /**