diff --git a/lib/ace/document.js b/lib/ace/document.js
index 24d82cc3..14e04ff9 100644
--- a/lib/ace/document.js
+++ b/lib/ace/document.js
@@ -56,7 +56,7 @@ var Document = function(text) {
 
     // There has to be one line at least in the document. If you pass an empty
     // string to the insert function, nothing will happen. Workaround.
-    if (text.length == 0) {
+    if (text.length === 0) {
         this.$lines = [""];
     } else if (Array.isArray(text)) {
         this._insertLines(0, text);
@@ -107,10 +107,10 @@ var Document = function(text) {
     **/
 
     // check for IE split bug
-    if ("aaa".split(/a/).length == 0)
+    if ("aaa".split(/a/).length === 0)
         this.$split = function(text) {
             return text.replace(/\r\n|\r/g, "\n").split("\n");
-        }
+        };
     else
         this.$split = function(text) {
             return text.split(/\r\n|\r|\n/);
@@ -136,11 +136,11 @@ var Document = function(text) {
           case "unix":
             return "\n";
           default:
-            return this.$autoNewLine;
+            return this.$autoNewLine || "\n";
         }
     };
 
-    this.$autoNewLine = "\n";
+    this.$autoNewLine = "";
     this.$newLineMode = "auto";
     /**
      * [Sets the new line mode.]{: #Document.setNewLineMode.desc}
@@ -311,9 +311,10 @@ var Document = function(text) {
 
         // apply doesn't work for big arrays (smallest threshold is on safari 0xFFFF)
         // to circumvent that we have to break huge inserts into smaller chunks here
-        if (lines.length > 0xFFFF) {
-            var end = this._insertLines(row, lines.slice(0xFFFF));
-            lines = lines.slice(0, 0xFFFF);
+        while (lines.length > 0xF000) {
+            var end = this._insertLines(row, lines.slice(0, 0xF000));
+            lines = lines.slice(0xF000);
+            row = end.row;
         }
 
         var args = [row, 0];
@@ -327,7 +328,7 @@ var Document = function(text) {
             lines: lines
         };
         this._signal("change", { data: delta });
-        return end || range.end;
+        return range.end;
     };
 
     /**