The mb_encode_mimeheader() function in Utf8/Bootup/mbstring.php returns with a result from Patchwork\PHP\Shim\mb_encode_mimeheader() in PHP/Shim/Mbstring.php but Patchwork\PHP\Shim\mb_encode_mimeheader() itself actually returns a void. This produces code inspection warnings and possible bugs.
The mb_encode_mimeheader() function in Utf8/Bootup/mbstring.php returns with a result from Patchwork\PHP\Shim\mb_encode_mimeheader() in PHP/Shim/Mbstring.php but Patchwork\PHP\Shim\mb_encode_mimeheader() itself actually returns a void. This produces code inspection warnings and possible bugs.