use a locale-independent comparison

has slightly better performance, and is more stable (since it doesn't
rely upon the configured locale)

Author: notslang

lib/sort-lines.coffee

@@ -28,19 +28,22 @@ sortTextLines = (editor, sorter) ->
 
 sortLines = (editor) ->
   sortTextLines editor, (textLines) ->
-    textLines.sort (a, b) -> a.localeCompare(b)
+    textLines.sort (a, b) -> if a is b then 0 else if a > b then 1 else -1
 
 sortLinesReversed = (editor) ->
   sortTextLines editor, (textLines) ->
-    textLines.sort (a, b) -> b.localeCompare(a)
+    textLines.sort (a, b) -> if a is b then 0 else if a < b then 1 else -1
 
 uniqueLines = (editor) ->
   sortTextLines editor, (textLines) ->
     textLines.filter (value, index, self) -> self.indexOf(value) == index
 
 sortLinesInsensitive = (editor) ->
   sortTextLines editor, (textLines) ->
-    textLines.sort (a, b) -> a.toLowerCase().localeCompare(b.toLowerCase())
+    textLines.sort (a, b) ->
+      a = a.toLowerCase()
+      b = b.toLowerCase()
+      if a is b then 0 else if a > b then 1 else -1
 
 sortLinesNatural = (editor) ->
   sortTextLines editor, (textLines) ->