fix: no round method

jax_galsim/position.py

@@ -134,8 +134,8 @@ def shear(self, shear):
         shear_pos = jnp.dot(shear_mat, self._array)
         return PositionD(shear_pos[0], shear_pos[1])
 
-    @implements(_galsim.Position.round)
     def round(self):
+        """Return the rounded-off PositionI version of this position."""
         return PositionI(jnp.round(self.x), jnp.round(self.y))
 
     def tree_flatten(self):