[issue15988] Inconsistency in overflow error messages of integer argument

[Oren Milman]

Oren Milman added the comment:

now that you opened #29816 and #29819, should I remove from the PR changes in the following functions, and related tests?
- _io_BytesIO_truncate_impl
- _io_StringIO_truncate_impl
- long_rshift
- long_lshift

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15988>
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