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[ticket/17496] Fix Implicitly marking parameters as nullable PHP deprecations
Also use union types consistently instead of question marks. Fixed with php-cs-fixer. PHPBB-17496
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@@ -293,7 +293,7 @@ class filesystem implements filesystem_interface
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/**
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* {@inheritdoc}
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*/
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public function mirror($origin_dir, $target_dir, \Traversable $iterator = null, $options = array())
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public function mirror($origin_dir, $target_dir, \Traversable|null $iterator = null, $options = array())
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{
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try
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{
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