Do not make the encoded document larger than expected #67
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The Unicode replacement character becomes 2 bytes in UTF-8 (0xFF 0xFD). Replacing \0 with this character causes the encoded string to be one byte longer, making it possible for the encoded document to be longer than the maximum document size.
Use the ASCII substitute character instead: it's only 1 byte long in UTF-8, so it does not make the encoded document grow.
This is going to help with GitGuardian/ggshield#561.