When a console command prints out default arguments (such as when you do `./command help blah`), it filters the value through json_encode. Why?
If your default argument value is http://example.com/test.txt, you get something like this from `./command help blah`: Usage: blah [-u|--url="..."] Options: --url (-u) A url. (default: "http:\/\/example.com\/text.txt") https://github.com/symfony/Console/blob/master/Input/InputDefinition.php#L529
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