docs: def plan_tr(p, *args, **kwargs):
      '''
      plan_tr(p, ...) yields a copy of plan p in which the afferent and efferent values of its
        functions have been translated. The translation is found from merging the list of 0 or more
        dictionary arguments given left-to-right followed by the keyword arguments. If the plan that
        is given is not a plan object explicitly, calc_tr will attempt to coerce it to one.
      '''
      if not is_plan(p):
          p = plan(p)
      return p.tr(*args, **kwargs)