title: How to convert excel sheet to List<int> bytes?
body: <p>I am using <a href="https://pub.dev/packages/excel" rel="nofollow noreferrer">excel</a> dart package to edit my excel file. I need to convert the excel into a list of integer bytes List</p>
  <pre><code>var excel;
  excel = Excel.decode(bytes)
  </code></pre>
  <p>Is that possible to convert the <strong>excel</strong> to again bytes (opposite of decoding) ?
  There are other packages like <a href="https://pub.dev/packages/syncfusion_flutter_xlsio" rel="nofollow noreferrer">syncfusion_flutter_xlsio</a> which have a property to save the workbook as List bytes like this:</p>
  <pre><code>List&lt;int&gt; bytes = workbook.saveAsStream();
  </code></pre>
  <p>I don't want to use File system for read/write, Thanks</p>