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Another module might simply take a hash to describe how things should be parameterized. It all depends on the needs of the module being used. The aim being to avoid polluting the caller’s namespace any more than necessary. If I use a DataMapper type package, then all I want to end up with in my client classes are appropriate instance accessor methods, I don’t need spare class methods like property or storage_names that are only of any use when I’m describing my class.