fix(watch): handle the deep watch with primitive value

[linzhe141]

I think #11983 is a bug
fix #11983

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB (+43 B)	38 kB (+7 B)	34.2 kB (-16 B)
vue.global.prod.js	160 kB (+43 B)	58 kB (+6 B)	51.5 kB (+28 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	49 kB	18.9 kB	17.2 kB
createApp	55.6 kB (+43 B)	21.4 kB (+7 B)	19.5 kB (-32 B)
createSSRApp	59.6 kB (+43 B)	23.1 kB (+2 B)	21 kB (+3 B)
defineCustomElement	60.4 kB (+43 B)	22.9 kB (+3 B)	20.9 kB (-53 B)
overall	69.4 kB (+43 B)	26.5 kB (-1 B)	24.1 kB (+61 B)

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commit: 1fd3fd7

[skirtles-code]

I think #7167 is similar. I'm not sure why it was closed, it might have been a misunderstanding.

I'm not sure whether this a bug or not. Personally, I think it's an arbitrary choice between two different behaviours. It isn't immediately obvious to me which is better. To be clear, I think the question that we need to answer here is...

• If deep: true is used and the value is currently a primitive, should it perform the change check?

If we do the check for a function source then I would also expect to do the same for other types of source that can evaluate to a primitive. e.g. a ref:

• Playground

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	❌ failure	❌ failure
nuxt	✅ success	✅ success
pinia	✅ success	✅ success
primevue	✅ success	✅ success
quasar	✅ success	✅ success
radix-vue	✅ success	✅ success
router	✅ success	✅ success
test-utils	✅ success	✅ success
vant	✅ success	✅ success
vite-plugin-vue	✅ success	✅ success
vitepress	✅ success	✅ success
vue-i18n	✅ success	✅ success
vue-macros	❌ failure	❌ failure
vuetify	✅ success	✅ success
vueuse	❌ failure	✅ success
vue-simple-compiler	✅ success	✅ success

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	❌ failure	❌ failure
nuxt	✅ success	✅ success
pinia	✅ success	✅ success
primevue	✅ success	✅ success
quasar	✅ success	✅ success
radix-vue	✅ success	✅ success
router	✅ success	✅ success
test-utils	✅ success	✅ success
vant	✅ success	✅ success
vite-plugin-vue	✅ success	✅ success
vitepress	✅ success	✅ success
vue-i18n	✅ success	✅ success
vue-macros	❌ failure	❌ failure
vuetify	✅ success	✅ success
vueuse	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success