When you change this to true, you may need to add more tests.
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* lib/base64.rb (Base64.urlsafe_encode64): a new option "padding" to
suppress the padding character ("=").
* lib/base64.rb (Base64.urlsafe_decode64): now it accepts not only
correctly-padded input but also unpadded input.
[Feature #10740][ruby-core:67570]
* test/base64/test_base64.rb: Test for above
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RFC 4648. It adds no line feed when encoding, and raise ArgumentError
if the encoded string contains non-alphabet (including CR and LF).
* lib/base64.rb: added. This provides encoding/decoding method for
Base64 in standard RFC 2045, Base64 in standard RFC 4648 and ``Base 64
Encoding with URL and Filename SafeAlphabet'' in RFC 4648.
* test_pack.c, test/base64/test_base64.rb: add tests for above.
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