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Smalltalk implementations have had text export/import for ages, and image based source control as you point out, is also quite old, Monticello wasn't the first.



In some way, Smalltalk had/has a more advanced and semantic diffing called ChangeSet


For example, CUIS book, 9.3 The Change Set:

https://cuis-smalltalk.github.io/TheCuisBook/The-Change-Set....




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