bleh, revert some stuff

lib/models/node.js

@@ -63,12 +63,9 @@ const Node = {
 
     // If the start and end nodes are the same, just remove characters.
     if (startKey == endKey) {
-      const startNode = node.getDescendant(startKey)
-      const characters = startNode.characters.filterNot((char, i) => {
-        return startOffset <= i && i < endOffset
-      })
-
-      node = node.updateDescendant(startNode.merge({ characters }))
+      let text = node.getDescendant(startKey)
+      text = text.removeCharacters(startOffset, endOffset)
+      node = node.updateDescendant(text)
       return node
     }
 

lib/models/text.js

@@ -22,7 +22,7 @@ class Text extends Record(DEFAULTS) {
    * Create a new `Text` with `properties`.
    *
    * @param {Object} properties
-   * @return {Node} node
+   * @return {Text} text
    */
 
   static create(properties = {}) {
@@ -64,6 +64,24 @@ class Text extends Record(DEFAULTS) {
       .join('')
   }
 
+  /**
+   * Remove characters from the text node from `start` to `end`.
+   *
+   * @param {Number} start
+   * @param {Number} end
+   * @return {Text} text
+   */
+
+  removeCharacters(start, end) {
+    let { characters } = this
+
+    characters = characters.filterNot((char, i) => {
+      return start <= i && i < end
+    })
+
+    return this.merge({ characters })
+  }
+
 }
 
 /**