Serhiy Storchaka added the comment:

When I said this, I understood that the patch should be backported to 
maintained releases.

Unpatched Python with Tcl 8.5:

>>> import tkinter; tcl = tkinter.Tcl()
>>> tcl.call('expr', 'false')
<booleanString object: 'false'>
>>> bool(tcl.call('expr', 'false'))
True

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue21526>
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