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EventNamesWithAck previously excluded events whose callback had no non-error arguments (e.g. `(cb: () => void) => void` or `(cb: (err: Error) => void) => void`). This made it impossible to use emitWithAck as a simple acknowledgement mechanism without data. The fix removes the FirstNonErrorArg void check while keeping the guard against events with no parameters at all, so events like `() => void` (no callback) are still correctly excluded. Related: https://github.com/socketio/socket.io/issues/5257
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