Further to GrandFather's post:   Part of the useful enhanced context would be an expected hash structure for each multiple parameter/value pair string (hopefully, more than just one!) that you provide. E.g., for the multi-line string example here, do you expect

%values = (
  'radius' => 3,
  'density' => .014,
  'URL' => '"https://www.geometry.org"',
  'max_no_of_attempts' => 4,
  );
[download]

or do you want something like

%values = (
  ...,
  'URL' => 'https://www.geometry.org',
  ...,
  );
[download]

(double-quotes stripped away)? How should wonky quoted strings be handled? By die-ing. By warn-ing and continuing to process? In another way?

And yes, I think a module probably already exists to do this sort of thing.