| ⇢ | A | Headers added | 
| ⇢ | B | Headers::getPluralFormsCount() added | |
| ⇢ | A | Headers::get() added | |
| ⇢ | A | Headers::remove() added | |
| ⇢ | A | CatalogArray::setHeaders() added | |
| ⇢ | A | Headers::__construct() added | |
| ⇢ | A | Headers::has() added | |
| ⇢ | A | Headers::all() added | |
| ⇢ | A | Headers::set() added | |
| ⇢ | A | Header::getId() added | |
| ⇢ | A | Header::getValue() added | |
| ⋮ | view more | ||
| B | ↛ | Header::getPluralFormsCount() removed | |
| A | ↛ | Header::getHeaderValue() removed | |
| A | ↛ | CatalogArray::addHeaders() removed | |
| A | ↛ | CatalogArray::getHeader() removed | |
| A | ↛ | Header::asArray() removed | |