code: def pop_bytes(self, nbytes, force=False):
          
          data = self.read_bytes(self.STACK, nbytes, force=force)
          self.STACK += nbytes
          return data
docs: Read `nbytes` from the stack, increment the stack pointer, and return
          data.
  
          :param int nbytes: How many bytes to read
          :param force: whether to ignore memory permissions
          :return: Data read from the stack