When add listener by once, it will be wrapped into another function.
And when pass listener and there is just one event listener added by
once, it will return 0 even if passed listener equal wrapped event
listener.
Refs: https://github.com/nodejs/node/pull/46523
PR-URL: https://github.com/nodejs/node/pull/48592
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/46523
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
