673: Mainline

Thus, there are three good reasons to avoid call-by-value class-object parameters:

• As you learned in Chapter 37, the subclass portion of a class argument is not copied.
• As you learned in this chapter, copying can lead to obscure excessive-reclamation bugs.
• Copying at call time and reclamation at return time go against the philosophy-of-language principle that identifies objects with real-world individuals.