[issue17828] More informative error handling when encoding and decoding

[Nick Coghlan]

Changes by Nick Coghlan <ncoghlan at gmail.com>:


Added file: http://bugs.python.org/file32562/issue17828_improved_codec_errors_v6.diff

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17828>
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