reimplement zstd compression support #4
Description
This is not open source in upstream, but the zstandard library is open source, and the code is so modular, it's like 10 ines of code to add it to mutagen again.
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This is not open source in upstream, but the zstandard library is open source, and the code is so modular, it's like 10 ines of code to add it to mutagen again.