code: func NewPooledCloner(atl atlas.Atlas) PooledCloner {
  	return PooledCloner{
  		pool: sync.Pool{
  			New: func() interface{} {
  				return refmt.NewCloner(atl)
  			},
  		},
  	}
  }
docs: // NewPooledCloner returns a PooledCloner with the given atlas. Do not copy
  // after use.