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Crashlogs for Swift apps have a bunch of problems and terminology that's not defined anywhere public that I can find.Why do stack frames that show the filename often show a line number of zero? Like (Filename.swift:0) instead of the real line number.What do these things mean:protocol witnessmergedfunction signature specialization <Arg[0] = Owned To Guaranteed, Arg[1] = Owned To Guaranteed>partial apply forwarder for closure #1merged closure #1reabstraction thunk helper from @callee_owned () -> () to @callee_unowned @convention(block) () -> () (NetworkReachabilityManager.swift:0)?