Text_CAPTCHA_Numeral bugs

There are two bugs in Text_CAPTCHA_Numeral Pear Module. Here is the patch.
diff -Nuar Text\_CAPTCHA\_Numeral-1.3.0.ok/php-pear-Text-CAPTCHA-Numeral.xml Text\_CAPTCHA\_Numeral-1.3.0/php-pear-Text-CAPTCHA-Numeral.xml
--- Text\_CAPTCHA\_Numeral-1.3.0.ok/php-pear-Text-CAPTCHA-Numeral.xml	2010-10-24 04:16:40.000000000 +0200
+++ Text\_CAPTCHA\_Numeral-1.3.0/php-pear-Text-CAPTCHA-Numeral.xml	2010-11-18 23:15:05.000000000 +0100
@@ -43,7 +43,7 @@
    -   +   diff -Nuar Text\_CAPTCHA\_Numeral-1.3.0.ok/Text/CAPTCHA/Numeral.php Text\_CAPTCHA\_Numeral-1.3.0/Text/CAPTCHA/Numeral.php
--- Text\_CAPTCHA\_Numeral-1.3.0.ok/Text/CAPTCHA/Numeral.php	2010-10-24 04:16:39.000000000 +0200
+++ Text\_CAPTCHA\_Numeral-1.3.0/Text/CAPTCHA/Numeral.php	2010-11-18 23:13:58.000000000 +0100
@@ -355,7 +355,7 @@
      \*/
     private function setOperation($type = null)
     {
-        if (!stristr($type, 'F')) {
+        if (stristr($type, 'F')) {
             $this->operation = $this->getFirstNumber() . ' ' . $this->operator;
         } else {
             $this->operation = $this->getFirstNumber() . ' ' .
@@ -514,6 +514,15 @@
                 ->setSecondNumber($first)
                 ->setOperation();
         }
+        /\*\*
+        \* Get rid of problematic zero result
+        \*/
+        elseif ($first == $second) {
+            $this->setFirstNumber($first)
+                 ->setSecondNumber($second-1)
+                 ->setOperation();
+        }
+

         $answer = $this->getFirstNumber() - $this->getSecondNumber();
         $this->setAnswer($answer);