[issue17618] base85 encoding

[Martin Morrison]

Martin Morrison added the comment:

>> Can you elaborate on this? What leakage is there? I assume this is some
> implementation quirk of the struct module that I'm not aware of.
>
> issue14596.

Thanks for the pointer. I will rework the patch for the encoder/decoders 
to use an explicit Struct so that the inbuilt cache gets bypassed and we 
don't "leak",

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17618>
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