Martin Panter added the comment:
unicode.patch avoids an overflow in PyUnicode_Join():
>>> size = int(sys.maxsize**0.5) + 1
>>> "".join(("A" * size,) * size)
Objects/unicodeobject.c:9927:12: runtime error: signed integer overflow: 46341
+ 2147441940 cannot be represented in type 'int'
OverflowError: join() result is too long for a Python string
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Added file: http://bugs.python.org/file43856/unicode.patch
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<http://bugs.python.org/issue1621>
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