fied as an array of objects; the
properties of the object are similar to the script: filenames are
specified with "fn", and the text of the file via "text", or
alternatively, you may specify a "url" from which the content is to
be fetched.

The output files ("outputs") are an array of filenames. After the
script finishes, the "Perl runner" will attempt to read these files
and display them to the user. It is also possible to specify output
files with the same name as an input file, for example if Perl's "-i"