message: trim() for safety in filter declaration
diff: @@ -139,6 +139,7 @@ export namespace Category {
  const field_blacklist: string[] = [];
  for (let d of directives.split(/[\r\n]+/)) {
  + d = d.trim();
  // allow for empty lines in config
  if (d.length === 0) continue;
  // let ! denote blacklisted entries
  