[issue17859] improve error message for saving ints to file

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka at gmail.com>:


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resolution:  -> duplicate
stage: needs patch -> resolved
status: open -> closed
superseder:  -> add "buffer protocol" to glossary

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17859>
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