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This was also an experiment to see if it were easier to implement a new feature when using the instruction encoder. Verdict: It's not that much easier, but I think it's certainly much more readable, because the description of the Instruction annotates what each field means. Right now, precise knowledge of x86_64 instructions is still required because things like when to set the 64-bit flag, how to read x86_64 instruction references, etc. are still not automatically done for you. In the future, this interface might make it sligtly easier to write an assembler for x86_64, by abstracting the bit-fiddling aspects of instruction encoding.