First off, thanks for writing a pure Go implementation! My team has wanted to use zstd in our project for a long time now, but have been trying to avoid having any c-Go dependencies.

We have one use-case in particular that would really benefit from the ability to train and use custom dictionaries on the fly.

Is that feature on your roadmap anytime soon? and if not, how challenging do you think it would be for me to try upstream it? I'm happy to contribute some engineering work.

Cheers,
Richie