Merge singular and plural tags
Why don't moderators merge tags which are just singular and plural forms of the same word?
image - images
graph - graphs
best-practice - best-practices
tree - trees
feature-request - feature-requests
And some tags have very similar meaning: tags - tagging.
It is annoying when searching and asking questions, especially given the limit of 5 tags per question.
Maybe it would be best to have the tags in plural form be automatically changed to singular?