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Currently, PyType_Ready() is called late on many static types, which can lead to bugs. For example, PyObject_SetAttr() can fail if the type of the object is not ready yet. PyType_Read() is responsible to initialize tp_getattro and tp_setattro members of the PyTypeObject structure.
We must explicitly initialize all static types before using them.
Moreover, many static types initialize explicitly :
 tp_getattro = PyObject_GenericGetAttr
and:
 tp_setattro = PyObject_GenericSetAttr
whereas it's the default implementation. They can be omitted.
I created this issue as a placeholder for multiple changes to modify how types implemented in C are initialized.