what is the current state of Yarr? Is it being actively developed? Is there some tutorial or documentation available?

I'm deciding between repa and yarr for some linear algebra computations. I found some references that yarr is more performant, but I couldn't find much documentation and the hackage page [1] hasn't indexed most modules for some reason, so there seems to be no good place to start from. And the last commit was 9 months ago.

[1] https://hackage.haskell.org/package/yarr

Thank you,

Petr