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Merge "Improve String.toCharArray documentation."

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-     * Copies the characters in this string to a character array.
-     *
-     * @return a character array containing the characters of this string.
+     * Returns a new {@code char} array containing a copy of the characters in this string.
+     * This is expensive and rarely useful. If you just want to iterate over the characters in
+     * the string, use {@link #charAt} instead.
     public char[] toCharArray() {
         char[] buffer = new char[count];
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