SF bug #460020: bug or feature: unicode() and subclasses.
Given an immutable type M, and an instance I of a subclass of M, the
constructor call M(I) was just returning I as-is; but it should return a
new instance of M. This fixes it for M in {int, long}. Strings, floats
and tuples remain to be done.
Added new macros PyInt_CheckExact and PyLong_CheckExact, to more easily
distinguish between "is" and "is a" (i.e., only an int passes
PyInt_CheckExact, while any sublass of int passes PyInt_Check).
Added private API function _PyLong_Copy.
diff --git a/Include/longobject.h b/Include/longobject.h
index e592891..6b10625 100644
--- a/Include/longobject.h
+++ b/Include/longobject.h
@@ -12,6 +12,7 @@
extern DL_IMPORT(PyTypeObject) PyLong_Type;
#define PyLong_Check(op) PyObject_TypeCheck(op, &PyLong_Type)
+#define PyLong_CheckExact(op) ((op)->ob_type == &PyLong_Type)
extern DL_IMPORT(PyObject *) PyLong_FromLong(long);
extern DL_IMPORT(PyObject *) PyLong_FromUnsignedLong(unsigned long);