I'm just playing with the new 2.0 API and [in /tags there is a field `inname`][1] that I can't find any description or documentation for.

What does it do? Is it like the old `filter` parameter on the old API?

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**Update:** Now that I have the answer I've retagged this as a bug, meaning an omission from the documentation.

  [1]: http://api.stackexchange.com/docs/tags