| ⇢ | A | NullCG added |
| ⇢ | A | VariableCG::getFilter() added | |
| ⇢ | A | NullCG::compareLength() added | |
| ⇢ | A | VariableCG::__construct() added | |
| ⇢ | A | VariableCG::isFiltered() added | |
| ⇢ | A | NullCG::__construct() added | |
| B | ↘ | C | VariableCG::compareLength() got worse |
| A | ↛ | VariableFixedCG::isFixed() removed | |
| A | ↛ | VariableCG::variableHasFilter() removed |