| ⇢ | A | TransformTrait added | |
| B | ↗ | A | Collection improved |
| ⇢ | A | TransformTrait::map() added | |
| ⇢ | A | TransformTrait::mapWithKey() added | |
| ⇢ | A | TransformTrait::column() added | |
| ⇢ | A | TransformTrait::flip() added | |
| A | ↛ | Collection::map() removed | |
| A | ↛ | Collection::column() removed | |
| A | ↛ | Collection::flip() removed |