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/Modules/cjkcodecs/multibytecodec.c b/Modules/cjkcodecs/multibytecodec.c
index 1b37845..8635a56 100644
--- a/Modules/cjkcodecs/multibytecodec.c
+++ b/Modules/cjkcodecs/multibytecodec.c
@@ -1579,12 +1579,13 @@
                       PyObject *unistr)
 {
     PyObject *str, *wr;
+    _Py_identifier(write);
 
     str = encoder_encode_stateful(STATEFUL_ECTX(self), unistr, 0);
     if (str == NULL)
         return -1;
 
-    wr = PyObject_CallMethod(self->stream, "write", "O", str);
+    wr = _PyObject_CallMethodId(self->stream, &PyId_write, "O", str);
     Py_DECREF(str);
     if (wr == NULL)
         return -1;
@@ -1650,7 +1651,9 @@
     assert(PyBytes_Check(pwrt));
     if (PyBytes_Size(pwrt) > 0) {
         PyObject *wr;
-        wr = PyObject_CallMethod(self->stream, "write", "O", pwrt);
+        _Py_identifier(write);
+
+        wr = _PyObject_CallMethodId(self->stream, &PyId_write, "O", pwrt);
         if (wr == NULL) {
             Py_DECREF(pwrt);
             return NULL;