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This change updates all occurrences of `std::endl` to `\n` across various files for improved efficiency and consistency. It reduces unnecessary flushing of output buffers associated with `std::endl` while maintaining the same output format.
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Prevent my future self or other contributors from using assert in tests and then having that assert not do anything because of the NDEBUG macro.
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Bidirectional base64; will be used by JSON v2.
