I think the Smalltalk systems that use image-based persistence[1] meet that criterion, despite the image itself eventually being persisted in a file system. [1

I think the Smalltalk systems that use image-based persistence[1] meet that criterion, despite the image itself eventually being persisted in a file system. [1] https://en.wikipedia.org/wiki/Smalltalk#Image-based_persistence https://en.wikipedia.org/wiki/Smalltalk#Image-based_persiste...