title: Why does multiplying two fractional Doubles and converting the result to a String result in extraneous zeroes?
body: <pre><code>var d1 = 0.124 * 0.12456 // 0.01544544
  var s1 = String(d1)      // 0.015445440000000001
  
  var d2 = 0.01544544      // 0.01544544
  var s2 = String(d2)      // 0.01544544
  </code></pre>
  <p>Why does converting the product of two fractional Doubles to a String result in extraneous zeroes (ending with 1) in the fractional portion of the result, but converting a fractional Double explicitly to a String does not? And how can I remove the extraneous portion from the result?</p>