Fix “A non well formed numeric value encountered”

src/Readability.php

@@ -61,7 +61,7 @@ class Readability implements LoggerAwareInterface
     // constants
     const SCORE_CHARS_IN_PARAGRAPH = 100;
     const SCORE_WORDS_IN_PARAGRAPH = 20;
-    const GRANDPARENT_SCORE_DIVISOR = 2.2;
+    const GRANDPARENT_SCORE_DIVISOR = 2;
     const MIN_PARAGRAPH_LENGTH = 20;
     const MIN_COMMAS_IN_PARAGRAPH = 6;
     const MIN_ARTICLE_LENGTH = 200;
@@ -1115,7 +1115,7 @@ class Readability implements LoggerAwareInterface
             // Add the score to the parent. The grandparent gets half.
             $parentNode->getAttributeNode('readability')->value += $contentScore;
             if ($grandParentNode) {
-                $grandParentNode->getAttributeNode('readability')->value += $contentScore / self::GRANDPARENT_SCORE_DIVISOR;
+                $grandParentNode->getAttributeNode('readability')->value += round($contentScore / self::GRANDPARENT_SCORE_DIVISOR);
             }
         }
 

tests/ReadabilityTest.php

@@ -193,7 +193,7 @@ class ReadabilityTest extends \PHPUnit\Framework\TestCase
         $this->assertEmpty($readability->getTitle()->getInnerHtml());
         $this->assertContains('This is an awesome text with some links, here there are', $readability->getContent()->getInnerHtml());
         $this->assertNotContains('<aside>', $readability->getContent()->getInnerHtml());
-        $this->assertContains('<footer readability="4"/>', $readability->getContent()->getInnerHtml());
+        $this->assertContains('<footer readability="5"/>', $readability->getContent()->getInnerHtml());
     }
 
     public function testWithClasses()