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JSON_ESCAPE = { "&" => '\u0026', ">" => '\u003e', "<" => '\u003c', "\u
+2028" => '\u2028', "\u2029" => '\u2029' }
JSON_ESCAPE_REGEXP = /[\u2028\u2029&><]/u

{
  my %escape = (
...
    return wantarray ? @json : join('', @json);
  }
}