there are 7 packages, listed in abstraction level order

bottom abstraction

• spi: bottom of the abstraction

concrete implementations

• iterator/any: these two packages are tangled together, doing decoding
• output: doing encoding, should only depend on spi

addons

• annotation: make spi accessible with annotation. everything here can be done using code
• fuzzy: pre-defined decoders to work with messy input
• extra: extra encoders/decoders, useful for a lot of people, but not all of them
• static_codegen: command to generate encoder/decoder statically