Released on 2019-10-20?
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+bpo-36698: IDLE no longer fails when writing non-encodable characters
+to stderr. It now escapes them with a backslash, like the regular
+Python interpreter. Add an errors field to the standard streams.
+
+bpo-13153: Improve tkinter's handing of non-BMP (astral) unicode
+characters, such as 'rocket \U0001f680'. Whether a proper glyph or
+replacement char is displayed depends on the OS and font. For IDLE,
+astral chars in code interfere with editing.
+
bpo-35379: When exiting IDLE, catch any AttributeError. One happens
when EditorWindow.close is called twice. Printing a traceback, when
IDLE is run from a terminal, is useless and annoying.