This week we had serious case of "how come it doesn't work on production? It did work on my laptop". After the release one core function did not work. Not in a sense that it threw exception. More like it didn't apply the changes it was suppose to. We opened the code, we looked at it and we scratched or heads wondering "what the hell is going on?!". This specific method that was responsible for the work even had good unit tests that were finishing successfully. We eventually found the cause of the issue a...