fix arabic lowercase

Author: faissaloux

src/Investigator.php

@@ -18,17 +18,19 @@ private function notLowercasesIn(array $array): array
         $unwanted = [];
 
         foreach ($array as $word) {
-            if ($word === '') {
+            if (is_array($word)) {
+                array_push($unwanted, ...$this->notLowercasesIn($word));
+
                 continue;
             }
 
-            if (is_array($word)) {
-                array_push($unwanted, ...$this->notLowercasesIn($word));
+            $clean = preg_replace('/[^A-Za-z]/', '', $word);
 
+            if ($clean == '') {
                 continue;
             }
 
-            if (! ctype_lower(preg_replace('/[^A-Za-z]/', '', $word))) {
+            if (! ctype_lower($clean)) {
                 $unwanted[] = $word;
             }
         }

tests/Fixtures/returnsArrayOnlyLowercase.php

@@ -13,4 +13,5 @@
     'lowercase',
     'lower',
     'case',
+    'العربية',
 ];