Rectangle and RectangleBorder don't like negative width/height

RectangleBorder shows a filled rectangle when Rect has negative width/height:

Shapes.Draw.RectangleBorder(new Rect(Vector2.zero, new Vector2(1, 1)), 1 / 100f, Color.green);   // works!
Shapes.Draw.RectangleBorder(new Rect(Vector2.zero, new Vector2(-1, 1)), 1 / 100f, Color.red);    // the rectangle is filled with the color
Shapes.Draw.RectangleBorder(new Rect(Vector2.zero, new Vector2(1, -1)), 1 / 100f, Color.yellow); // the rectangle is filled with the color
Shapes.Draw.RectangleBorder(new Rect(Vector2.zero, new Vector2(-1, -1)), 1 / 100f, Color.blue);  // the rectangle is filled with the color

Rectangle doesn't show anything when Rect has negative width/height:

Shapes.Draw.Rectangle(new Rect(Vector2.zero, new Vector2(1, 1)), 1 / 100f, Color.green);   // works!
Shapes.Draw.Rectangle(new Rect(Vector2.zero, new Vector2(-1, 1)), 1 / 100f, Color.red);    // ?
Shapes.Draw.Rectangle(new Rect(Vector2.zero, new Vector2(1, -1)), 1 / 100f, Color.yellow); // ?
Shapes.Draw.Rectangle(new Rect(Vector2.zero, new Vector2(-1, -1)), 1 / 100f, Color.blue);  // ?

Thanks!