Type Definition mtbl::MergeFn
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type MergeFn = Fn(&[u8], &[u8], &[u8]) -> Vec<u8>;
An MTBL merging function: given a key and two values for that key, create a merged value for that key.
Note that, according to the Rust documentation, such functions should not panic, because such functions are called from C code via the FFI (Foreign Function Interface).