make normalizeConfig public and static
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@ -58,7 +58,7 @@ abstract class Extension extends BaseExtension
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* @param array A config array
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* @param key The key to normalize
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*/
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protected function normalizeConfig($config, $key)
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public static function normalizeConfig($config, $key)
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{
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$values = array();
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if (isset($config[$key.'s'])) {
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