want to add encoding as well?

safe decoding is important however is limited, the `puffs` is designed elegant I admit and want to use in decoding some proprietary binary format, but to occasionally to write in such format is also a need, would you like to support encoding eventually? to make the cost of learning a different language more of worthy?

https://github.com/google/puffs/blob/master/std/gif/decode_lzw.puffs for example, would you make some code generator support encoding functions to enable write gif files in lzw compression?