sz := l.sizeEstimate(*target)

			// Worst case size is where is that a separator of "" is used, and each char is returned as a list element.
			max := sz.Max
			if len(args) > 1 {
				if v := args[1].Expr().AsLiteral(); v != nil {
					if i, ok := v.Value().(int64); ok {
						max = uint64(i)
					}
				}
			}
			// Cost is the traversal plus the construction of the result.