[docs] [issue10977] Concrete object C API considered harmful to subclasses of builtin types

Changes by Arfrever Frehtes Taifersar Arahesis <Arfrever.FTA@GMail.Com>: ---------- nosy: +Arfrever _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue10977> _______________________________________