doc: document diverging MessagePort.onmessage handling
Fixes: https://github.com/nodejs/node/issues/26463 PR-URL: https://github.com/nodejs/node/pull/26487 Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
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@ -319,6 +319,9 @@ listeners are attached.
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This method exists for parity with the Web `MessagePort` API. In Node.js,
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it is only useful for ignoring messages when no event listener is present.
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Node.js also diverges in its handling of `.onmessage`. Setting it will
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automatically call `.start()`, but unsetting it will let messages queue up
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until a new handler is set or the port is discarded.
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### port.unref()
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<!-- YAML
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