old_contents: from task import *
  
  __all__ = [
      is_project,
      is_task_of,
      project_with_completed_tasks,
      project_with_incomplete_tasks,
      is_processing,
      is_complete,
      is_incomplete,
  ]
  
new_contents: from task import *
  
  __all__ = [
      is_project,
      is_task_of,
      project_with_completed_tasks,
      project_with_incomplete_tasks,
      project_with_processing_tasks,
      is_processing,
      is_complete,
      is_incomplete,
  ]
  
subject: add filter project_with_processing_tasks