[issue17840] base64_codec uses assert for runtime validity checks

[Nick Coghlan]

Nick Coghlan added the comment:

I'd be slightly more inclined to file the fact that "ignore" isn't supported by the base64 codec as a potential bug, with changing the docs as one possible resolution.

It shouldn't hold up switching from the assertions to proper runtime checks.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17840>
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