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If you use `import` to load a package and subpackage:
 import package
 import package.subpackage
 
Then the `package` module instance will contain a `subpackage` attribute:
 assert "subpackage" in dir(sys.modules['package']), "This works."
 
But if you use Python's `imp` module to import these packages instead, the same assertion will fail.
Is this a python documentation oversight, or a bug with the `imp` module? 
To reproduce, clone the associated hg repro and follow the instructions in the README file. Thanks!