HTML Entities are being decoded, possibly leading to html tags being returned

[Wertisdk]

When passing a string with HTML Entities, the convert method will decode these and return them as-is.
This can lead to some unintentional behaviour if you have used htmlentities to encode text with legitimate html code converted to "string" / HTML Entities.

See this test:

use PHPUnit\Framework\TestCase;
use Soundasleep\Html2Text;

class Html2TextTest extends TestCase
{
  public function testKeepsHtmlEntities()
  {
      $html = '<p>Test <b>bold</b> &lt;script&gt;alert(&quot;nope!&quot;)&lt;/script&gt; <script>alert(\'text\')</script> <i>italic</i> <u>underline</u> <s>strikethrough</s> <a href="http://example.com">link</a></p>';
      $expected = "Test bold &lt;script&gt;alert(&quot;example!&quot;)&lt;/script&gt;  italic underline strikethrough [link](http://example.com)";
  
      $this->assertEquals($expected, Html2Text::convert($html));
  }
}

Output:

Failed asserting that two strings are equal.
--- Expected
+++ Actual
@@ @@
-'Test bold <script>alert("example!")</script>  italic underline strikethrough [link](http://example.com)'
+'Test bold <script>alert("nope!")</script>  italic underline strikethrough [link](http://example.com)'

I believe this is unintentional behaviour, because we end up with raw HTML code - the exact opposite of the intention when calling convert.