demo: Cython 3.2 fails with bool | None annotation

Author: oscarbenjamin

src/flint/types/_gr.pyx

@@ -602,11 +602,11 @@ cdef class gr_ctx(flint_ctx):
     ###
     # Square Roots
 
-    def is_square(self, x):
+    def is_square(self, x) -> bool | None:
         """
         Returns whether x is a perfect square in the context.
         """
-        return self._is_square(self(x))
+        return truth_to_py(self._is_square(self(x)))
 
     def sqrt(self, x) -> gr:
         """