Issue #3156879 by alexpott, Krzysztof Domański: \Drupal\Component\Utility\Bytes::toInt() - ensure $size is a number type

core/lib/Drupal/Component/Utility/Bytes.php

@@ -35,7 +35,8 @@ class Bytes {
       return round($size * pow(self::KILOBYTE, stripos('bkmgtpezy', $unit[0])));
     }
     else {
-      return round($size);
+      // Ensure size is a proper number type.
+      return round((float) $size);
     }
   }
 

core/tests/Drupal/Tests/Component/Utility/BytesTest.php

@@ -56,6 +56,9 @@ class BytesTest extends TestCase {
       ['76MRandomStringThatShouldBeIgnoredByParseSize.', 79691776],
       // 76.24 GB (with typo).
       ['76.24 Giggabyte', 81862076662],
+      ['1.5', 2],
+      ['2.4', 2],
+      ['', 0],
     ];
   }