Turned return type annotations of private methods into php return types.

Author: derrabus

FormFieldRegistry.php

@@ -162,10 +162,8 @@ private static function create($base, array $values)
 
     /**
      * Transforms a PHP array in a list of fully qualified name / value.
-     *
-     * @return array The list of fields as [string] Fully qualified name => (mixed) value)
      */
-    private function walk(array $array, ?string $base = '', array &$output = [])
+    private function walk(array $array, ?string $base = '', array &$output = []): array
     {
         foreach ($array as $k => $v) {
             $path = empty($base) ? $k : sprintf('%s[%s]', $base, $k);
@@ -186,7 +184,7 @@ private function walk(array $array, ?string $base = '', array &$output = [])
      *
      * @return string[] The list of segments
      */
-    private function getSegments(string $name)
+    private function getSegments(string $name): array
     {
         if (preg_match('/^(?P<base>[^[]+)(?P<extra>(\[.*)|$)/', $name, $m)) {
             $segments = [$m['base']];