Does this example help: There is a name defined in Base, e.g. `pop`. In languages that do not use multumethods, when you created your own "FancyContainerLibrary" you need to create a new `pop` and ensure it does not clash with `Base.pop`. In languages with multimethods you just extend `Base.pop` to work on your new type. Julia can do both: it has perfectly normal support for namespaces, but frequently you will be extending Base methods instead of working in your own namespace (of course, all your private functions are usually unexported and available only from your namespace and do not polute the global space).
