0.16.1

session_forget deleted the session correctly and then reported that it had never existed.

Closing the last browser makes the server write the session down, and a session with no browsers left is erased - so the erase at the end of the tool had nothing left to erase, and its answer was being read as "did this session exist". Nothing was ever left behind; the sentence was wrong, and it is the sentence a model reads before deciding the name it used must be the wrong one.

Found by trying 0.16.0 in a clean environment from the index rather than by any test, which is why the test that should have caught it is fixed too: it asserted that the session id appeared in the answer, and the id appears in both answers the tool can give.