Exact URL where the bug happened
https://lichess.org/learn#/9/1
Steps to reproduce the bug

1. Go to https://lichess.org/learn#/9/1, you have to have your progress reseted if you've already done this lesson.
2. Click on "LET'S GO".
3. Play a wrong move, for example Bf2.
4. Click on RETRY.

What did you expect to happen?
Simply reset the position.
What happened instead?
Th

看了fish-redux的todoList demo，发现里面连接全局状态的方法是使用visitor

visitor: (String path, Page<Object, dynamic> page) {
      /// 只有特定的范围的 Page 才需要建立和 AppStore 的连接关系
      /// 满足 Page<T> ，T 是 GlobalBaseState 的子类
      if (page.isTypeof<GlobalBaseState>()) {
        /// 建立 AppStore 驱动 PageStore 的单向数据连接
        /// 1. 参数1 AppStore
        /// 2. 参数2 当 AppStore.state 变化时, PageStore.state 该如何变化
     

I just came across the fact that a Show[Throwable] exists.

1. It is not wired up into import Scalaz._, one needs to import scalaz.std.java.throwable._
2. It discards the stack trace entirely.

What's going on with this? :D
Is it OK if I fix both of these (for 7.2 and 7.3)?

Should suppress --strict warnings.

Most awesome FP libraries (Cats, Scalaz, Monocle, Algebird etc ) have microsite done by sbt-microsites

Adding one for Shapeless would make it easier for newcomers. Quick, online reference on what is available

The migration guide here should be expanded with additional content regarding upgrading from Observable to ZStream.