MimeTypes::getMimeTypes() errors on custom mimetypes. #36715
Description
Symfony version(s) affected: looks like 4.2+
Description
Type error: Type error: Return value of Symfony\Component\Mime\MimeTypes::getMimeTypes() must be of the type array, string returned when passing custom map through constructor.
How to reproduce
$type =(new MimeTypes([ 'application/octet-stream' => ['rrd'] ]))->getMimeTypes('rrd')
Possible Solution
Add []'s around $mimeType in constructor