Implemented the native CharSequence version of toCharArray

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1089724 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/commons/lang3/StringUtils.java b/src/main/java/org/apache/commons/lang3/StringUtils.java
index 849814d..796020f 100644
--- a/src/main/java/org/apache/commons/lang3/StringUtils.java
+++ b/src/main/java/org/apache/commons/lang3/StringUtils.java
@@ -6489,8 +6489,12 @@
         if (cs instanceof String) {
             return ((String) cs).toCharArray();
         } else {
-            // TODO: Implement rather than convert to String
-            return cs.toString().toCharArray();
+            int sz = cs.length();
+            char[] array = new char[cs.length()];
+            for (int i=0; i < sz; i++) {
+                array[i] = cs.charAt(i);
+            }
+            return array;
         }
     }