| ⇢ | A | Stack::pop() added | |
| ⇢ | A | Stack::count() added | |
| ⇢ | A | Stack::isEmpty() added | |
| ⇢ | A | Stack::push() added | |
| ⇢ | A | Stack::current() added | |
| ⇢ | A | Stack::next() added | |
| ⇢ | A | Stack::key() added | |
| ⇢ | A | Stack::valid() added | |
| ⇢ | A | Stack::rewind() added | |
| C | ↘ | D | Interpreter::checkMinimalPush() got worse |
| B | ↗ | A | Stack::add() improved |
| A | ↛ | Stack::typeCheck() removed |