The exit handler called onExit("Unexpected shutdown") whenever the Go
runtime exited. That was upstream's wording from when nothing could stop
the runtime, so every exit really was a panic. This fork added shutdown(),
so a clean teardown now reports itself as a crash to the panic handler
createIPN() hands to its callers.
Split the two cases. Before the IPN reaches the caller an exit is a
startup failure, and rejecting hands it back as an error rather than as a
side-channel callback. After that the caller holds the only shutdown
path, so report the exit without claiming it was unexpected.
Found in review of webnet/webnet#188.
Co-Authored-By: claude-opus-5 <noreply@anthropic.com>
codingetandClaude
738fea52f8