Leaflet Draw 0.4.9控制不能使用Leaflet 1.1.0？

我創建了一個非常簡單的codepen，但是在嘗試創建繪圖控件時出現錯誤。Leaflet Draw 0.4.9控制不能使用Leaflet 1.1.0？

我以爲它是簡單的東西，我做錯了。但我看了看我現在用的是CDN，我什麼也看不到明顯的：

https://cdnjs.cloudflare.com/ajax/libs/leaflet.draw/0.4.9/leaflet.draw-src.js

這些都是我在控制檯中看到的錯誤：

Util.js:15 Uncaught TypeError: Cannot add property segmentsIntersect, object is not extensible 
    at Object.extend (Util.js:15) 
    at LineUtil.Intersect.js:6 
    at EditToolbar.Delete.js:145 extend @ Util.js:15 (anonymous) @ LineUtil.Intersect.js:6 (anonymous) @ EditToolbar.Delete.js:145 pen.js:11 Uncaught TypeError: L.Control.Draw is not a constructor 
    at pen.js:11

var map = L.map("root").setView([42, -71], 7); 

L.tileLayer("http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png", { 
    attribution: 
    '&copy <a href="http://www.openstreetmap.org/copyright" target="_blank">OpenStreetMap</a> contributors' 
}).addTo(map); 

var drawnItems = new L.FeatureGroup(); 
map.addLayer(drawnItems); 

var drawControl = new L.Control.Draw({ 
    edit: { 
    featureGroup: drawnItems 
    } 
}); 
map.addControl(drawControl);

來源

2017-07-02 Dr.YSG