readAsArrayBuffer(blob) {
        webidl.brandCheck(this, _FileReader);
        webidl.argumentLengthCheck(arguments, 1, "FileReader.readAsArrayBuffer");
        blob = webidl.converters.Blob(blob, { strict: false });
        readOperation(this, blob, "ArrayBuffer");
      }
@see https://w3c.github.io/FileAPI/#dfn-readAsArrayBuffer
@param {import('buffer').Blob} blob