Understanding Arity in `Function.dual` with Optional and Unknown Parameters

hi, i am trying to use dual api once again, and again i got confused how arity works in

Function.dual

Function.dual

Function.dual

Function.dual

static fromUnknownError(message?: string, options?: Omit<TaggedInternalErrorOptions, 'cause'>) {
  return (error: unknown) => new UserAvatarError(message, { ...options, cause: inferCauseFromUnknownError()(error) })
}

static fromUnknownError(message?: string, options?: Omit<TaggedInternalErrorOptions, 'cause'>) {
  return (error: unknown) => new UserAvatarError(message, { ...options, cause: inferCauseFromUnknownError()(error) })
}

static fromUnknownError(message?: string, options?: Omit<TaggedInternalErrorOptions, 'cause'>) {
  return (error: unknown) => new UserAvatarError(message, { ...options, cause: inferCauseFromUnknownError()(error) })
}

static fromUnknownError(message?: string, options?: Omit<TaggedInternalErrorOptions, 'cause'>) {
  return (error: unknown) => new UserAvatarError(message, { ...options, cause: inferCauseFromUnknownError()(error) })
}

i want to convert this into dual api using

Function.dual

Function.dual

Function.dual

Function.dual but i dont understand what to pass in arity when fields are optional and unknown

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Understanding Arity in `Function.dual` with Optional and Unknown Parameters

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