Yeah, but the parent&#x27;s phrase was:<p>&quot;If you have a non-concurrency-safe map implementation in a language that&#x27;s advertised as being good for concurrency, there is definitely something wrong&quot;.<p>If we accept his premise, then the fact that &quot;they wasn&#x27;t designed for that&quot; is no excuse. It&#x27;s like selling a kids toy that has tiny choke-inducing parts. In that case, just saying: &quot;It wasn&#x27;t designed to be eaten by kids&quot; is not really an excuse.