Fix nullabe props not getting undefined union

[devTeaa]

close #12098

The original implementation didn't carry over the union type

[devTeaa]

Can this be merged @edison1105 ?

[pkg-pr-new[bot]]

Open in Stackblitz

@vue/compiler-core

pnpm add https://pkg.pr.new/@vue/compiler-core@12103

@vue/compiler-dom

pnpm add https://pkg.pr.new/@vue/compiler-dom@12103

@vue/compiler-ssr

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@vue/reactivity

pnpm add https://pkg.pr.new/@vue/reactivity@12103

@vue/compiler-sfc

pnpm add https://pkg.pr.new/@vue/compiler-sfc@12103

@vue/runtime-core

pnpm add https://pkg.pr.new/@vue/runtime-core@12103

@vue/runtime-dom

pnpm add https://pkg.pr.new/@vue/runtime-dom@12103

@vue/server-renderer

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@vue/shared

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vue

pnpm add https://pkg.pr.new/vue@12103

@vue/compat

pnpm add https://pkg.pr.new/@vue/compat@12103

commit: d685cd3

[github-actions[bot]]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38 kB	34.2 kB
vue.global.prod.js	159 kB	57.9 kB	51.4 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.9 kB	18.3 kB	16.7 kB
createApp	55 kB	21.3 kB	19.4 kB
createSSRApp	59 kB	23 kB	20.9 kB
defineCustomElement	59.8 kB	22.8 kB	20.8 kB
overall	68.7 kB	26.3 kB	24 kB

[yyx990803]

Looks like the type tests are not passing. We also need a test case dedicated for what this intends to fix.

[devTeaa]

updated @yyx990803 , @edison1105

[devTeaa]

Will close then, since it's expected