[posco]

The global Mode is gone in 0.9.0. And there is an implicit from Grouped to TypedPipe, so you don't need to call .toTypedPipe (that directly seems less likely to cause problems, especially given we have mapValues and filter on Grouped, so we should avoid needlessly leaving the Grouped representation).

[bkirwi]

Neat! It looks like things are changing fast; I'll have to do another read-through.