Spread operating reducer state includes reducers in the state.

[quisido]

addReducer('name', global => ({
  ...global, // reducers are now in the state
  newKey: 'new value'
}));

Best practice is to not spread operate the root, because there is no need to. This may not be intuitive to Redux users, so I'd like to support spread operating as a "backwards compatible" syntax, despite it being unnecessary.

I am pretty sold on the idea of having reducers available inside reducers.

Current fix is to silently ignore attempts to set state properties that share a name with reducers.