[Ellipse] force radii to float dtype

masque/shapes/ellipse.py

@@ -42,7 +42,7 @@ class Ellipse(PositionableImpl, Shape):
 
     @radii.setter
     def radii(self, val: ArrayLike) -> None:
-        val = numpy.array(val).flatten()
+        val = numpy.array(val, dtype=float).flatten()
         if not val.size == 2:
             raise PatternError('Radii must have length 2')
         if not val.min() >= 0:

masque/test/test_shape_advanced.py

@@ -122,6 +122,12 @@ def test_curve_polygonizers_clamp_large_max_arclen() -> None:
         assert len(polys[0].vertices) >= 3
 
 
+def test_ellipse_integer_radii_scale_cleanly() -> None:
+    ellipse = Ellipse(radii=(10, 20))
+    ellipse.scale_by(0.5)
+    assert_allclose(ellipse.radii, [5, 10])
+
+
 def test_path_edge_cases() -> None:
     # Zero-length segments
     p = MPath(vertices=[[0, 0], [0, 0], [10, 0]], width=2)