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1. I am OK with the following text, modeling referred Perldoc:
b2a_base64( $bytes, $eol );
Encode data by calling the encode_base64() function. The first argument is the byte string to encode. 
The second argument is optional, and provides the line-ending sequence to use. When it is given, the returned encoded string is broken into lines of no more than 76 characters each and it will end with $eol unless it is empty. Pass an empty string, or no second argument at all if you do not want the encoded string to be broken into lines.
2. I already had people telling me that "Python-3 doc prohibits input longer than 57 bytes, even though it doesn't currently enforce it". Please help putting end to spreading of this confusion.