Is there a way to morph an optional value back to a required one?

the example bellow always returns a number, but is typed as {PORT?: number | undefined}

const schema = type({
  PORT: ['string?', '=>', (v?: string) => parseInt(v ?? '3000')]
})

const schema = type({
  PORT: ['string?', '=>', (v?: string) => parseInt(v ?? '3000')]
})

Is there a way to morph an optional value back to a required one? - arktype