message: Fix return type of PyUnicodeAsUtf8Compat to `const char*` to precisely match to the return type of `PyUnicode_AsUTF8`.
diff: @@ -21,7 +21,7 @@ limitations under the License.
  #include "tensorflow/python/lib/core/safe_pyobject_ptr.h"
  namespace {
  -inline char* PyUnicodeAsUtf8Compat(PyObject* obj) {
  +inline const char* PyUnicodeAsUtf8Compat(PyObject* obj) {
  #if PY_MAJOR_VERSION < 3
  return PyString_AS_STRING(obj);
  #else
  