code: function () {
              var header = this._header;
              this._separator = _gpfArrayForEachFalsy(_gpfCsvSeparators, function (separator) {
                  if (header.includes(separator)) {
                      return separator;
                  }
              }) || _gpfCsvSeparators[_GPF_START];
          }
docs: Deduce separator from header line
  @since 0.2.3