js/leaflet.markercluster.js
function (method, context) {
    var markers = this._needsClustering.slice(),
      i;

    if (this._topClusterLevel) {
      this._topClusterLevel.getAllChildMarkers(markers);
    }

    for (i = markers.length - 1; i >= 0; i--) {
      method.call(context, markers[i]);
    }

    this._nonPointGroup.eachLayer(method, context);
  }
function (method, context) {
    var markers = this._needsClustering.slice(),
      i;

    if (this._topClusterLevel) {
      this._topClusterLevel.getAllChildMarkers(markers);
    }

    for (i = markers.length - 1; i >= 0; i--) {
      method.call(context, markers[i]);
    }

    this._nonPointGroup.eachLayer(method, context);
  }
Overrides LayerGroup.eachLayer