Add API for static strings, primarily good for identifiers.
Thanks to Konrad Schöbel and Jasper Schulz for helping with the mass-editing.
diff --git a/Include/abstract.h b/Include/abstract.h
index 0fe0956..3946ec5 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -7,6 +7,7 @@
 #ifdef PY_SSIZE_T_CLEAN
 #define PyObject_CallFunction _PyObject_CallFunction_SizeT
 #define PyObject_CallMethod _PyObject_CallMethod_SizeT
+#define _PyObject_CallMethodId _PyObject_CallMethodId_SizeT
 #endif
 
 /* Abstract Object Interface (many thanks to Jim Fulton) */
@@ -307,11 +308,22 @@
      Python expression: o.method(args).
        */
 
+     PyAPI_FUNC(PyObject *) _PyObject_CallMethodId(PyObject *o, _Py_Identifier *method,
+                                                  char *format, ...);
+
+       /*
+         Like PyObject_CallMethod, but expect a _Py_Identifier* as the
+         method name.
+       */
+
      PyAPI_FUNC(PyObject *) _PyObject_CallFunction_SizeT(PyObject *callable,
                                                          char *format, ...);
      PyAPI_FUNC(PyObject *) _PyObject_CallMethod_SizeT(PyObject *o,
                                                        char *name,
                                                        char *format, ...);
+     PyAPI_FUNC(PyObject *) _PyObject_CallMethodId_SizeT(PyObject *o,
+                                                       _Py_Identifier *name,
+                                                       char *format, ...);
 
      PyAPI_FUNC(PyObject *) PyObject_CallFunctionObjArgs(PyObject *callable,
                                                          ...);