Can't understand Geometry2D.merge_polygons(a: PackedVector2Array, b: PackedVector2Array). At Godot 4.0

**Your Godot version:**
Godot 4.0 beta 2
**Issue description:**
Hey, I'm opened docs about Geometry2D.merge_polygons, but don't understand, how to find difference between polygons in returned value. There written about inner and outer polygons and is_polygon_clocwise, but I don't know which direction spins outer polygon, and which - inner. Can you help me with this problem?
**URL to the documentation page (if already existing):**
https://docs.godotengine.org/en/latest/classes/class_geometry2d.html#class-geometry2d-method-merge-polygons