mithril stream .map does not trigger next stream value

Mithril version:

2.0.4

Browser and OS:

Chrome on Mac OSX

Project:

Meiosis

Steps to Reproduce

• Create an update stream
• Create a states stream by scanning the `update stream
• Call states.map(state => effect(state) where effect triggers another update

Expected Behavior

• Expect the effect function to be called again
• Here is a flems showing the expected behavior
• Notice the output on the console:
  • { route: 'Home', routeChanged: true, data: [] }
  • { route: 'Home', routeChanged: false, data: [], loading: true }
  • { route: 'Home', routeChanged: false, data: [ 'duck', 'quack' ], loading: false }

Current Behavior

• The effect function is not called again
• Here is a flems showing the current behavior
• Notice the output on the console:
  • { route: 'Home', routeChanged: true, data: [] }
  • { route: 'Home', routeChanged: false, data: [], loading: true }
• The third state is missing because the effect function should have been called again, but it is not.

Context

This is to set up the Meiosis pattern with Effects.

Note: This commit fixes the same issue in Meiosis-Setup's simple-stream.