[issue17840] base64_codec uses assert for runtime validity checks

[Martin Panter]

Martin Panter added the comment:

Is this patch likely to go ahead? It has been sitting around a while and would conflict with patches I am working on.

If so, I reckon it would be good to factor out some of the new bits of code (_check_strict, _StrictErrors) into a common place, like the “codecs” module.

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nosy: +vadmium

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<http://bugs.python.org/issue17840>
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