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copied!<p>Well, let's look at <a href="http://hackage.haskell.org/packages/archive/attoparsec/0.10.4.0/doc/html/Data-Attoparsec-Text.html">the documentation</a>.</p> <ul> <li><p><a href="http://hackage.haskell.org/packages/archive/attoparsec/0.10.4.0/doc/html/Data-Attoparsec-Text.html#v%3adouble"><code>double</code></a></p> <blockquote> <p><em>Note:</em> This function is almost ten times faster than <code>rational</code>, but is slightly less accurate.</p> <p>The <code>Double</code> type supports about 16 decimal places of accuracy. For 94.2% of numbers, this function and <code>rational</code> give identical results, but for the remaining 5.8%, this function loses precision around the 15th decimal place. For 0.001% of numbers, this function will lose precision at the 13th or 14th decimal place. </p> </blockquote></li> <li><p><a href="http://hackage.haskell.org/packages/archive/attoparsec/0.10.4.0/doc/html/Data-Attoparsec-Text.html#v%3anumber"><code>number</code></a></p> <blockquote> <p><em>Note:</em> This function is almost ten times faster than <code>rational</code>. On integral inputs, it gives perfectly accurate answers, and on floating point inputs, it is slightly less accurate than rational. </p> </blockquote></li> </ul> <p>They are both acknowledged to be slightly inaccurate (in exchange for being relatively fast). <code>number</code>'s inaccuracy is not quantified, so the fact that its inaccuracy is not the same as <code>double</code>'s is not a bug. </p> <p>If accuracy is paramount, use <a href="http://hackage.haskell.org/packages/archive/attoparsec/0.10.4.0/doc/html/Data-Attoparsec-Text.html#v%3arational"><code>rational</code></a>.</p>

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