js/leaflet.markercluster.js
function (anArray, obj) {
    for (var i = anArray.length - 1; i >= 0; i--) {
      if (anArray[i] === obj) {
        anArray.splice(i, 1);
        return true;
      }
    }
  }
function (anArray, obj) {
    for (var i = anArray.length - 1; i >= 0; i--) {
      if (anArray[i] === obj) {
        anArray.splice(i, 1);
        return true;
      }
    }
  }
Remove the given object from the given array