loose the type check in complexDivFloat

complexTruediv will pass subtype of float to complexDivFloat,
so loose the type check in complexDivFloat, use PyFloat_Check
instead check the type exactly.

src/runtime/complex.cpp

@@ -220,7 +220,7 @@ extern "C" Box* complexDivFloat(BoxedComplex* lhs, BoxedFloat* rhs) {
     if (!PyComplex_Check(lhs))
         raiseExcHelper(TypeError, "descriptor '__div__' requires a 'complex' object but received a '%s'",
                        getTypeName(lhs));
-    assert(rhs->cls == float_cls);
+    assert(PyFloat_Check(rhs));
     if (rhs->d == 0.0) {
         raiseDivZeroExc();
     }

test/tests/complex.py

@@ -68,3 +68,9 @@ for x in data:
                                                                  arg2=y)))
             except Exception as e:
                 print(e.message)
+
+
+class F(float):
+    pass
+
+print(1j.__truediv__(F(1)))