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events: do not keep arrays with a single listener
Use the remaining listener directly if the array of listeners has only one element after running `EventEmitter.prototype.removeListener()`. Advantages: - Better memory usage and better performance if no new listeners are added for the same event. Disadvantages: - A new array must be created if new listeners are added for the same event. PR-URL: #12043 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Daijiro Wachi <daijiro.wachi@gmail.com> Reviewed-By: Ron Korving <ron@ronkorving.nl>
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