Discussion on question by eccs0103: Цепочка вызовов из опциональных аргументов

Imported from a comment discussion on https://ru.stackoverflow.com/questions/1615079/%d0%a6%d0%b5%d0%bf%d0%be%d1%87%d0%ba%d0%b0-%d0%b2%d1%8b%d0%b7%d0%be%d0%b2%d0%be%d0%b2-%d0%b8%d0%b7-%d0%be%d0%bf%d1%86%d0%b8%d0%be%d0%bd%d0%b0%d0%bb%d1%8c%d0%bd%d1%8b%d1%85-%d0%b0%d1%80%d0%b3%d1%83%d0%bc%d0%b5%d0%bd%d1%82%d0%be%d0%b2