[ppseafield]

Ah, It seems I was very unlucky as I started learning it right before 3.0 and tried to pick it up after 3.0. Upgrading my previous project gave me strange errors, and the documentation had changed with it, leaving me to puzzle over what had happened.

[acemarke]

That must have been a pretty tight time window :) Per the releases page at https://github.com/reduxjs/redux/releases?after=v3.0.1 , you can see that 2.0 and 3.0 were only a couple weeks apart, and basically just tightened up the API around hot-swapping the root reducer.

Since then, the most meaningful API change was 3.1.0, which redid the `createStore` signature to allow passing an enhancer as an argument (as opposed to the original more FP-style approach).