spokje
--- a/core/modules/responsive_image/responsive_image.module
+++ b/core/modules/responsive_image/responsive_image.module
        // be sorted from small to large, since the first matching source will
        // be used. We multiply it by 100 so multipliers with up to two decimals
        // can be used.
-        $srcset[intval(mb_substr($multiplier, 0, -1) * 100)] = _responsive_image_image_style_url($image_style_mapping['image_mapping'], $variables['uri']) . ' ' . $multiplier;
+        /** @var int $multiplier_number */
+        $multiplier_number = ((float) mb_substr($multiplier, 0, -1)) * 100;