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BLAKE2 includes the expected output length in the initial state. This length is actually distinct from the actual output length used at finalization. BLAKE2b-256/128 is thus not the same as BLAKE2b-128. This behavior can be a little bit surprising, and has been "fixed" in BLAKE3. In order to support this, we may want to provide an option to set the length used for domain separation. In Zig, there is another reason to allow this: we assume that the output length is defined at comptime. But BLAKE2 doesn't have a fixed output length. For an output length that is not known at comptime, we can't take the full block size and truncate it due to the reason above. What we can do now is set that length as an option to get the correct initial state, and truncate the output if necessary.