What is the difference between UNA and a version control system?
In a version control system, developers work on copies of a document. They can work on these copies at the same time, but they are working on different documents. Later, the version control system tries to merge the different copies into one document, and runs into errors if the developers have made changes to the same lines of code. In UNA, developers edit the same document in real-time. So while UNA encourages multiple developers to work on the same piece of code simultaneously, a version control system strongly discourages it. Therefore, version control systems provide none of the advantages of UNA (even though they are important for other reasons).
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