taxonomy.module - duplicate terms allowed in same vocabulary

This issue arose when using the autotaxonomy feature of aggregator2 and I have filed appropriately there. When a new term is created, there is no checking that the term doesn't already exist in the same vocabulary. It can be observed without aggregator2. Create a new term. Create another with the same term name. It is created without complaint. This can cause a great deal of confusion and headaches when importing terms from other sources.

I don't believe that the module should complain about the duplicate term. It should simply ignore the creation of a new term node and return the term that is already there (so it doesn't break things like aggregator2 - which populates its data with the returned term id).