Issue #1521: on 64bit platforms, str.decode fails on very long strings.
The t# and w# formats were not correctly handled.
Will backport.
diff --git a/Misc/NEWS b/Misc/NEWS
index 05b7491..4fa85c6 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,11 @@
Core and builtins
-----------------
+- Issue #1521: On 64bit platforms, using PyArgs_ParseTuple with the t# of w#
+ format code incorrectly truncated the length to an int, even when
+ PY_SSIZE_T_CLEAN is set. The str.decode method used to return incorrect
+ results with huge strings.
+
- Issue #1402: Fix a crash on exit, when another thread is still running, and
if the deallocation of its frames somehow calls the PyGILState_Ensure() /
PyGILState_Release() functions.