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Keys of size 0 generally don't make sense: a key is supposed to be secret. There is one edge case which is "raw data" keys, which are useful to store non-key objects in the same storage location as keys. However those are also problematic because they involve a zero-length buffer. Manipulating zero-length buffers in C requires special cases with functions like malloc() and memcpy(). Additionally, 0 as a key size already has a meaning "unspecified", which does not always overlap seamlessly with the meaning "0". Therefore, forbid keys of size 0. No implementation may accept them.