title: Excel formatting codes
body: <p>I am reading the ECMA-376 specification and I am testing my understanding of the matter using Excel for real. I am basically in need of implementing a few of these codes in a GoLang script.</p>
  <p>What's the meaning of this format code <code>#,##0</code> and why couldn't it be simply written as <code>#,##</code>.</p>
  <p>In other words what's the meaning of the trailing zero ?</p>