And what happens if project A pins projects B and C, which in turn pin DIFFERENT versions of project D? Is there any language or environment out there that can

And what happens if project A pins projects B and C, which in turn pin DIFFERENT versions of project D? Is there any language or environment out there that can make that work? Node and npm have always been able to do this. Once upon a time this was accomplished via very hierarchical node_modules directories. This caused some issues, so the directory was flattened, however the multi-version compatibility was always maintained.