Create Clojure namespace when it's manually removed and buffer is evaluated

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If I remove a namespace using (remove-ns *ns*) and try to evaluate the current buffer then it fails to recreate the namespace:

; eval (buf): ...<.....>/testns.clj
; Namespace not found: <.....>.testns

Then I have to go to the REPL manually and type (ns testns) after which I can eval the namespace just fine