{
  "id": "username-collation",
  "ambiguity": "You asked for our matching rules without saying what they are: how case, punctuation and surrounding whitespace are treated.",
  "facts": [
    { "id": "collation", "fact": "Match without regard to case, treat a hyphen and an underscore as the same character because people type either, and do not trim the input: signup rejects names with leading or trailing spaces, so a padded name is somebody who does not exist and must not match.", "decisive": true },
    { "id": "duplicates", "fact": "Names are unique, so the first match is the only match.", "decisive": false }
  ],
  "stonewall": "No strong view on that one - use your judgement.",
  "volunteer": false
}