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Folly (C++ library by Facebook) also has an implementation that uses up to 23 bytes. They have a talk about it here. https://www.youtube.com/watch?v=kPR8h4-qZdk
It would be possible to do a much more compact SSO, but I think they've done it this way for performance reason. E g. I've implemented a vector with SSO, and there i only have 1 byte overhead: https://github.com/martinus/svector
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