diff --git lib/validator/opValidatorChoice.class.php lib/validator/opValidatorChoice.class.php
new file mode 100644
index 0000000..a4ab992
--- /dev/null
+++ lib/validator/opValidatorChoice.class.php
@@ -0,0 +1,84 @@
+<?php
+
+class opValidatorChoice extends sfValidatorChoice
+{
+  /**
+   * @see sfValidatorBase
+   */
+  protected function doClean($value)
+  {
+    $choices = $this->getChoices();
+
+    if ($this->getOption('multiple'))
+    {
+      $value = $this->cleanMultiple($value, $choices);
+    }
+    else
+    {
+      if (!self::inChoices($value, $choices))
+      {
+        throw new sfValidatorError($this, 'invalid', array('value' => $value));
+      }
+    }
+
+    return $value;
+  }
+
+  /**
+   * Cleans a value when multiple is true.
+   *
+   * @param  mixed $value The submitted value
+   *
+   * @return array The cleaned value
+   */
+  protected function cleanMultiple($value, $choices)
+  {
+    if (!is_array($value))
+    {
+      $value = array($value);
+    }
+
+    foreach ($value as $v)
+    {
+      if (!self::inChoices($v, $choices))
+      {
+        throw new sfValidatorError($this, 'invalid', array('value' => $v));
+      }
+    }
+
+    $count = count($value);
+
+    if ($this->hasOption('min') && $count < $this->getOption('min'))
+    {
+      throw new sfValidatorError($this, 'min', array('count' => $count, 'min' => $this->getOption('min')));
+    }
+
+    if ($this->hasOption('max') && $count > $this->getOption('max'))
+    {
+      throw new sfValidatorError($this, 'max', array('count' => $count, 'max' => $this->getOption('max')));
+    }
+
+    return $value;
+  }
+
+  /**
+   * Checks if a value is part of given choices (see bug #4212)
+   *
+   * @param  mixed $value   The value to check
+   * @param  array $choices The array of available choices
+   *
+   * @return Boolean
+   */
+  static protected function inChoices($value, array $choices = array())
+  {
+    foreach ($choices as $choice)
+    {
+      if ((string) $choice === (string) $value)
+      {
+        return true;
+      }
+    }
+
+    return false;
+  }
+}
diff --git test/unit/validator/opValidatorChoiceTest.php test/unit/validator/opValidatorChoiceTest.php
new file mode 100644
index 0000000..2a5e119
--- /dev/null
+++ test/unit/validator/opValidatorChoiceTest.php
@@ -0,0 +1,49 @@
+<?php
+
+include_once dirname(__FILE__) . '/../../bootstrap/unit.php';
+
+$t = new lime_test(9, new lime_output_color());
+
+$t->diag('opValidatorChoice');
+
+$t->diag('->clean()');
+
+$v = new opValidatorChoice(array(
+  'choices' => array('00', '000', '0.0'),
+));
+
+try
+{
+  $v->clean('0');
+  $t->fail('->clean() throws a sfValidatorError if not in choices');
+  $t->skip('', 1);
+}
+catch (Exception $e)
+{
+  $t->pass('->clean() throws a sfValidatorError if not in choices');
+  $t->is($e->getCode(), 'invalid', '->clean() throws a sfValidatorError');
+}
+
+$t->is($v->clean('00'), '00', '->clean() accepts in choices');
+$t->is($v->clean('000'), '000', '->clean() accepts in choices');
+$t->is($v->clean('0.0'), '0.0', '->clean() accepts in choices');
+
+
+$v = new opValidatorChoice(array(
+  'choices' => array('011', '11.0'),
+));
+
+try
+{
+  $v->clean('11');
+  $t->fail('->clean() throws a sfValidatorError if not in choices');
+  $t->skip('', 1);
+}
+catch (Exception $e)
+{
+  $t->pass('->clean() throws a sfValidatorError if not in choices');
+  $t->is($e->getCode(), 'invalid', '->clean() throws a sfValidatorError');
+}
+
+$t->is($v->clean('011'), '011', '->clean() accepts in choices');
+$t->is($v->clean('11.0'), '11.0', '->clean() accepts in choices');