Could you document that it is impossible rewind chef resource guard?

[bbaja42]

From what I see, in the resource source code, resource guards are a list, that is append only.
Since I lost a bit of time to figure it out, I thought it would be nice to extend the docs, to help other folks in future

In short, calling rewind on the guard, just adds the new guard instead of removing the exiting one.
The workaround is similar to one mentioned for the notifications, unwind the whole resource, and add a new one without the guard.

    def not_if(command=nil, opts={}, &block)
      if command || block_given?
        @not_if << Conditional.not_if(self, command, opts, &block) # APPEND ONLY LINE
      end
      @not_if
    end