For a long time, there's been a tag filter that blocks the creation of a "singular" tag if a "plural" of the same tag exists. Here's an example* of it working correctly. Diamond mods can bypass it.

The other day, this question created , while exists already.

Earlier today, this question created while exists already.

Is this change in behavior intentional, or is this a bug? If it's intentional, was it documented somewhere?

To demonstrate the busted-ness, I've also added to this question, where already existed.

  • maybe it only works in one direction, i.e. you can't create tags which is the plural of an existing tag, but you can create a tag which is the singular form of an existing (plural) tag? Just a wild guess Commented Jul 4, 2013 at 19:35
  • That is possible, but it seems silly if so, and it isn't what I remember it doing.
    – Charles
    Commented Jul 4, 2013 at 19:38
  • I tried it the other way on this port earlier and it seemed to go through, so it doesn't seem to work as expected here in any case.
    – Tim Stone
    Commented Jul 4, 2013 at 21:45
  • looking into it...
    – m0sa
    Commented Jul 5, 2013 at 8:48

1 Answer 1


Fix rolled out in release 2013.7.9.826. The checks were performed only on tags with approved synonyms.

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