backrefs comparison 2

https://qqpipi.com//index.php/How_Backrefs_Agency_Use_Transforms_Link_Building_Strategies

When you're tracking which parts of your code reference a particular symbol, backrefs comparison shows you exactly how those references have changed between two versions. It's like diffing just the usage count and location shifts, so you don't have to scan the whole codebase to see if a refactor introduced duplicate references or left dangling ones. This makes it a handy sanity check before merging changes that affect shared identifiers.