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| Guides on backward compatibility & deprecated practice |
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| ``Setuptools`` has undergone tremendous changes since its first debut. As its |
| development continues to roll forward, many of the practice and mechanisms it |
| had established are now considered deprecated. But they still remain relevant |
| as a plethora of libraries continue to depend on them. Many people also find |
| it necessary to equip themselves with the knowledge to better support backward |
| compatibility. This guide aims to provide the essential information for such |
