API topic's external_ID can't be reused after deleting a topic and creating a new one

Hi @blake,
We’re happily using the external_id feature for our integration. I note however that if we delete a Topic, we can not create a new one with the same external_id and instead receive the error:

{'action': 'create_post', 'errors': ['External has already been taken']}

Is it at all possible to re-use the same external_id after a Topic that used it is deleted?