Raise ValueError when attempting to set the _CHUNK_SIZE attribute of a…

Raise ValueError when attempting to set the _CHUNK_SIZE attribute of a TextIOWrapper to a huge value, not TypeError.

Misc/NEWS

@@ -27,6 +27,9 @@ Core and Builtins
 Library
 -------
 
+- Raise ValueError when attempting to set the _CHUNK_SIZE attribute of a
+  TextIOWrapper to a huge value, not TypeError.
+
 - Issue #12493: subprocess: Popen.communicate() now also handles EINTR errors
   if the process has only one pipe.
 

Modules/_io/textio.c

@@ -2556,7 +2556,7 @@ textiowrapper_chunk_size_set(textio *self, PyObject *arg, void *context)
 {
     Py_ssize_t n;
     CHECK_INITIALIZED_INT(self);
-    n = PyNumber_AsSsize_t(arg, PyExc_TypeError);
+    n = PyNumber_AsSsize_t(arg, PyExc_ValueError);
     if (n == -1 && PyErr_Occurred())
         return -1;
     if (n <= 0) {