n = (object, property, fn) => {
  object[property] = fn(object[property]);
  return object[property];
}
Resolves the value for a nested object option.
@template T
@template {keyof T} Property
@template Result
@param {T} object An object.
@param {Property} property A property of the provided object.
@param {function(T | undefined): Result} fn The handler to resolve the property's value.
@returns {Result} The resolved option value.