[Build Error][V-DataTable][ItemKeySlot<unknown>upgrade from 3.3.21 to 3.4

[velly]

I use and item.<key> to insert Collumn slot.

I met build error: - error TS18046: 'item' is of type 'unknown'.

But I cannot replay in https://play.vuetifyjs.com/#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

As you can see, the typeof item is object. not unknow. Anybody ever met this problem?

[velly]

I'm so confused by this.
Anyway, This is my workaround.

export function castUnknown(value: unknown): T {
return value as T;
}