Consider the following structure shown below. The entire Foo:: package (and in fact the module file itself) is only loaded if the conditional is hit.
Yeah, I see where you're coming from. As I said, its a style thing.
Personally I don't like it because it means users of the package then have to decide whether they want to keep their own script simple (all dependencies up the top) and simply pay the performance price, or go to extreme lengths to firstly understand where the performance penalties are coming from (which of potentially many packages, assuming this style is adopted everywhere) and then do something to handle it (usually resulting in scripts with difficult to find dependencies). The whole idea behind OO is that you encapsulate your data and code into separate classes. To me that also means making sure your classes don't shit all over the place until they have been instantiated.
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