Long story short - since 5.0 `np.array(Vector())` is now producing `np.float32` instead of `np.float64`. So we have to provide `dtype` explicitly to support both <5.0 and >= 5.0.
See https://projects.blender.org/blender/blender/issues/149283
Use explicit element argument instead of props.representation_obj as representation_obj may not be there (e.g. removing rep items without item mode) or some other object might be in item mode and then booleans won't be unmarked.
Found the issue because of the failing test 🥳
Andrej730