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- padding stripped
.. _`JOSE Base64`:
https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-37#appendix-C
.. Do NOT try to call this module "base64", as it will "shadow" the
standard library.
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:param data: Base64 string to be decoded. If it's unicode, then
only ASCII characters are allowed.
:type data: bytes or unicode
:returns: Decoded data.
:rtype: bytes
:raises TypeError: if input is of incorrect type
:raises ValueError: if input is unicode with non-ASCII characters
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