When using defineModel and setting the same value, the parent set event will not be triggered.

[masterYi2333]

Vue version

3.5.13

Link to minimal reproduction

https://play.vuejs.org/#eNqtU02P0zAQ/SuWL81KJVVbuFTpClj1ABKwAsQFI5Qm0653HcfyR6hU5b8ztjdJiUp3D6tKlWf8ZvzezMuRvlMqbRzQFc1MobmyxIB1iohc7teMWsPoNZO8UrW25OaOi5LsdF0RRtNZCH01o/9CFiPMYgQ6Eg27aVFXylkoSRvhEwRNmGSyqKWxJCdr0kGSI5OE7MEmV+FEsIF1WpK5j9qp/0feSZOLDpAL0DaZXwUAky0e/C+bRZkoCgMLlRK5BYwIyaK85lVVlyBQfI7as6jgBLA4j1gECCH+iZO2dIozREE7vk/vTS1x0IEgo14bR5JflOUomNEVeaSOfYWo/3wMOasdBH2h5g6KhzP5e3PwOUZvNRjQDQ67v7O5xsHF6823z3DAc3+JQpxA9IXLr2Bq4TzHCHvvZIm0T3CB7YewWi73383mYEGaTpQnOmyJUdzyzQXpA91l+rpbHk6xN9sTVu3sE1b0IxcO0Ecl7LiETz6VPBph52ThXycWTGeroSZFJzlYjxNIJVZfNlLJm+iGbOusxTfeFoIXD54kPoY0T/hks4iJlbNYOrbQ8BU9U73StTK98FsfZSOJK+mqLe5RttdxJrESKm77wg0GJvk5capELquhePLr/2P0HZIzJdNAKh0yocXLDHSbG3jWJH83oL01cY7L9E06X9L2L/jjtzM=

Steps to reproduce

click

What is expected?

The same value also triggers the set event

What is actually happening?

Set not triggered

System Info

No response

Any additional comments?

The results of the two modification methods are inconsistent. I'm not sure if this is a bug, but they were consistent in versions <=3.4.31. The scenario is that my set event performs other actions, and I don't care whether the value has changed or not.

Related discussion

[yangliguo7]

core/packages/runtime-core/src/helpers/useModel.ts

Lines 61 to 64 in 21f8d9d

	if (
	!hasChanged(emittedValue, localValue) &&
	!(prevSetValue !== EMPTY_OBJ && hasChanged(value, prevSetValue))
	) {

when using useModel and the data unchanged, the data will not be triggered. This is inconsistent with emit

I'm not sure if we should emit when the data hasn't changed.

If there is a definite conclusion, I can fix this problem

[edison1105]

related #11162 #11125

[d-ryabtsev]

core/packages/runtime-core/src/helpers/useModel.ts

Lines 61 to 64 in 21f8d9d

if (
!hasChanged(emittedValue, localValue) &&
!(prevSetValue !== EMPTY_OBJ && hasChanged(value, prevSetValue))
) {
when using useModel and the data unchanged, the data will not be triggered. This is inconsistent with emit

I'm not sure if we should emit when the data hasn't changed.

If there is a definite conclusion, I can fix this problem

Why would we not emit an event if the data hasn't changed? I have just hit this bug in our project and it took me a while to work what is going on.

Documentation claims that defineModel is a convenience macro for defineEmits/defineProps. Which is not the case because my use case works with defineEmits/defineProps but does not work with defineModel.

I think either the documentation should be fixed or this is a bug..