google-collections takes me to https://stackoverflow.com/questions/tagged/google-collections, and in the search box
[google-collections] gets displayed (note the brackets). Pressing enter (the searching has changed from full-text search to tag search) leads to https://stackoverflow.com/questions/tagged/guava, and the search term has changed to
So there's a search term replacement chain
[guava], which is a bit strange. First, a text gets replaced by a tag, and then, the tag gets replaced by another one due to aliasing. This should probably happen in one step.
Note that, despite the aliasing, the search results differ. ColinD (the guava guy answering most guava-related questions here) is not sure, if retagging should happen. Adding the
[guava] tag to all questions tagged
[google-collections] is not possible, since some of them already have the maximum tag count. Maybe adding it wherever possible and replacing otherwise could be the way to go?