fix copy nodes loop

lib/peer-discovery.js

@@ -202,11 +202,9 @@ module.exports = class PeerDiscovery {
 
     if (!nodes) nodes = this._closestNodes
     else if (this._closestNodes !== nodes) {
+      const len = nodes.length
       for (const newer of this._closestNodes) {
-        for (const older of nodes) {
-          if (!older.id || !newer.id || b4a.equals(older.id, newer.id)) continue
-          nodes.push(newer)
-        }
+        if (newer.id && !hasNode(nodes, len, newer)) nodes.push(newer)
       }
     }
 
@@ -288,4 +286,13 @@ class PeerDiscoverySession {
   }
 }
 
+function hasNode (nodes, len, node) {
+  for (let i = 0; i < len; i++) {
+    const existing = nodes[i]
+    if (existing.id && b4a.equals(existing.id, node.id)) return true
+  }
+
+  return false
+}
+
 function noop () {}