docs: def setup_step_into(self, frame, pure=False):
          """Setup debugger for a "stepInto"
          """
          self.frame_calling = frame
          if pure:
              self.frame_stop = None
          else:
              self.frame_stop = frame
          self.frame_return = None
          self.frame_suspend = False
          self.pending_stop = True 
          return