[Bug]: v-model should infer T or T[] based on multiple value

[iamandrewluca]

Environment

Developement/Production OS: macOS Sonoma 14.6.1 (23G93)
Node version: v20.17.0
Package manager: 9.4.0
Radix Vue version: 1.9.6
Vue version: 3.5.6
Nuxt version: N/A
Nuxt mode: N/A
Nuxt target: N/A
CSS framework: [email protected]
Client OS: macOS Sonoma 14.6.1 (23G93)
Browser: Chrome Version 129.0.6668.58 (Official Build) (arm64)

Link to minimal reproduction

https://github.com/iamandrewluca/issue-radix-vue-multiple/blob/3b59ed50ec9dda458462c42a7b9f35516e254858/src/App.vue#L20-L22

Steps to reproduce

• Create a Combobox with prop multiple
• Have a value of type Array<string>
• Use value on Combobox using v-model explicit approach (desugared)

Describe the bug

When using Combobox with multiple and having the value typed, and using explicit v-model, a type error occurs

Type 'string' is not assignable to type 'string[]'.ts-plugin(2322)

It is strange why when using v-model directly this error is ignored

Expected behavior

Depending on the value passed to the multiple prop, the Combobox should infer the type of $event emitted by @update:model-value event

A better approach would be to infer the $event type from the type of modelValue

Context & Screenshots (if applicable)

I started a draft MR, but not sure how exactly to test the types
#1309