defineModel coerces string to boolean in production build when string | boolean union is used

[zigomir]

Vue version

3.4.21

Link to minimal reproduction

https://play.vuejs.org/#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

Steps to reproduce

Make sure to first click on Comp.vue tab to render it first (dunno why this is needed, but it is).
Click on Dev to flip it to Prod in the top nav and see Value: turns to Value: true.

What is expected?

Dev and prod mode should work the same, keeping model value a string.

In other words, type annotation shouldn't coerce model's value.

What is actually happening?

Model turns to boolean in prod mode.

System Info

No response

Any additional comments?

Sorry if this has been reported, I couldn't easily find an issue if it was.

[sqal]

#9603

[Shyam-Chen]

https://vuejs.org/guide/components/props.html#boolean-casting

const value = defineModel<boolean | string>({ required: true });

[zigomir]

https://vuejs.org/guide/components/props.html#boolean-casting

const value = defineModel<boolean | string>({ required: true });

Thanks!

I now see that if I change order from <string | boolean> to <boolean | string> then both prod and dev work the same, which is definitely better. Although I still think that my reported case should work the same in dev as in prod.