Sorry I probably missed the test_uploader.py in the previous review. For unit tests, we don't rely on the compat module, instead we specify the expected version. Because we don't have tests when compat may or may not select different version within different resource class methods, this way we can ensure class methods calling compat returning the right version we expect.

We only discussed this when compat was introduced, but did not enforce the implementation across all other module, so there is some inconsistency in the code base. But prefer start to enforce it for the reason mentioned above.