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SUMMARY
Right now some modules still support API version 1.20. Docker SDK for Python dropped support for this in version 3.0.0 (it still supports API version 1.21 in the latest release), see docker/docker-py@df8422d. Supporting it in the rewrite (#364) would be quite an extra burden for something that likely nobody is still using. If someone is really still using it, they have to stick to an old version of Docker SDK for Python, and community.docker 2.x.y.
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various modules