fix(v-model): vModelSelect work with custom getter and setter edge case

[yangxiuxiu1115]

fix #12425

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+48 B)	38 kB (+29 B)	34.2 kB (+37 B)
vue.global.prod.js	158 kB (+48 B)	57.8 kB (+25 B)	51.5 kB (+67 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.2 kB	18.3 kB	16.8 kB
createApp	55.2 kB	21.3 kB	19.5 kB
createSSRApp	59.3 kB	23.1 kB	21 kB
defineCustomElement	60.1 kB	22.9 kB	20.8 kB
overall	69.1 kB	26.5 kB	24.1 kB

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commit: 7eab641

[edison1105]

LGTM.

For sure this behavior is consistent with vue2

• Playground with vue2
• Playground with this PR

[skirtles-code]

Using an equality check might be problematic if the collection is modified, rather than replaced.

For example:

• Playground
• Playground

I'm not sure how important handling cases like these is. The change doesn't make them any worse.