From 636862ab99acd2c324602428ae498ea19043c16e Mon Sep 17 00:00:00 2001
From: Vladimir Agafonkin <agafonkin@gmail.com>
Date: Tue, 29 Aug 2017 18:47:43 +0300
Subject: [PATCH] simplify getClusterExpansionZoom too

---
 index.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/index.js b/index.js
index 144ebcc..9c1c693 100644
--- a/index.js
+++ b/index.js
@@ -149,9 +149,10 @@ SuperCluster.prototype = {
         return tile.features.length ? tile : null;
     },
 
-    getClusterExpansionZoom: function (clusterId, clusterZoom) {
+    getClusterExpansionZoom: function (clusterId) {
+        var clusterZoom = (clusterId % 32) - 1;
         while (clusterZoom < this.options.maxZoom) {
-            var children = this.getChildren(clusterId, clusterZoom);
+            var children = this.getChildren(clusterId);
             clusterZoom++;
             if (children.length !== 1) break;
             clusterId = children[0].properties.cluster_id;