title: BigNumber.js simple subtraction giving wrong output
body: <p>I have used Bignumber.js API for performing some JS calculations involving large numbers. I am performing a subtraction where the result should be <code>0</code> but the output is like <code>-0.00000000000000000099</code>. How do I counter such issues with Bignumber API.</p>
  <pre><code>(new BigNumber(refinedGoal)).minus(monthlyReminder).toFixed()
  </code></pre>
  <p>gives <code>-0.00000000000000000099</code></p>
  <p>while using arithmetic subtraction operator</p>
  <pre><code>((new BigNumber(refinedGoal)) - monthlyReminder).toFixed()
  </code></pre>
  <p>gives <code>0</code>.
  My overall goal is to save this result <code>0</code> in some JSON variable.</p>
  <p>Edit 1:
  The <code>monthlyReminder.toFixed()</code> value is <code>1030.19999999999999999886</code>
  and <code>refinedGoal</code> value is <code>1030.2</code></p>