Allow setting __wrapped__ without having a factory in the cext implementation.

Author: ionelmc

src/lazy_object_proxy/cext.c

@@ -1014,10 +1014,8 @@ static PyObject *Proxy_get_wrapped(
 static int Proxy_set_wrapped(ProxyObject *self,
         PyObject *value)
 {
-    Proxy__ENSURE_WRAPPED_OR_RETURN_MINUS1(self);
-
     if (value) Py_INCREF(value);
-    Py_DECREF(self->wrapped);
+    if (self->wrapped) Py_DECREF(self->wrapped);
 
     self->wrapped = value;
 

tests/test_lazy_object_proxy.py

@@ -1677,6 +1677,20 @@ def test_new(lazy_object_proxy):
     pytest.raises(ValueError, lambda: a.__wrapped__)
 
 
+def test_set_wrapped_via_new(lazy_object_proxy):
+    obj = lazy_object_proxy.Proxy.__new__(lazy_object_proxy.Proxy)
+    obj.__wrapped__ = 1
+    assert str(obj) == '1'
+    assert obj + 1 == 2
+
+
+def test_set_wrapped(lazy_object_proxy):
+    obj = lazy_object_proxy.Proxy(None)
+    obj.__wrapped__ = 1
+    assert str(obj) == '1'
+    assert obj + 1 == 2
+
+
 @pytest.mark.parametrize("name", ["slots", "cext", "simple", "django", "objproxies"])
 def test_perf(benchmark, name):
     implementation = load_implementation(name)