### Breaking changes

The mixed parsing interface now passes `SyntaxNodeRef` values instead of `TreeCursor` instances around.

Creating a cursor at a given position is now done with `Tree.cursorAt`, not `cursor`.

Getting a cursor from a syntax node is now done with a method (`cursor`) rather than a getter.

`Tree.fullCursor` was removed and replaced by the `IncludeAnonymous` iteration mode.

The optional arguments to `enter` tree traversal methods were replaced with a single `mode` argument.

`Tree.iterate` now passes node objects, rather than type/from/to as separate arguments, to its callback functions.

### New features

The new `SyntaxNodeRef` type provides an interface shared by `SyntaxNode` and `TreeCursor`.

`TreeCursor` instances now how have an `iterate` method that calls a function for each descendant of the current node.

The new `matchContext` method on `SyntaxNode` and `TreeCursor` provides a convenient way to match the names of direct parent nodes.

Cursors can now be passed flags to control their behavior.