[issue8840] truncate() semantics changed in 3.1.2

[Terry J. Reedy]

Terry J. Reedy added the comment:

The docstring is unchanged from before the behavior change and to me still has problems a. to d. listed in msg106698.  The manual entry seems too longs to just copy, but I would not know know to condense it.

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<http://bugs.python.org/issue8840>
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