Limit Globs effect in one step and prevent inheritance

[abraverm]

In steps, when glob is applied, it is inherited to the following step:

steps: {
  1: {
    **: {
      style.fill: green
     }
     x: green
   } 
   2: {
   # every container becomes green
   }
}

Step 2 should inherit the "compiled" version of (1) rather than the definition.
Definitely some benefit current behaviour, but for them it is easy to re-apply the glob with an import ..., but the opposite will need to carefully use it or avoid it at all.

Example: When #1862 implemented, change the oppacity of previous steps

classes: {
  previous-step.style.opacity: 0.4
}
steps: {
  1: {
    **: {
      # append `step-1` class and use it as a tag 
      class: &step-1
     }
   } 
   2: {
     **: {
       &class: step-1
       # append class `previous-step`
       class: &previous-step
     }
     **: {
       !&class: previous-step
       class: &step-2
     }
   }
}