Preload intent proximity, no documentation

[gsouf]

Hi,

The source code has a config for preload intent proximity: https://github.com/TanStack/router/blob/main/packages/router-core/src/router.ts#L192C1-L199C41

  /**
   * The default `preloadIntentProximity` a route should use if no preloadIntentProximity is provided.
   *
   * @default 0
   * @link [API Docs](https://tanstack.com/router/latest/docs/framework/react/api/router/RouterOptionsType#defaultpreloadintentproximity-property)
   * @link [Guide](https://tanstack.com/router/latest/docs/framework/react/guide/preloading#preload-intent-proximity)
   */
  defaultPreloadIntentProximity?: number

but none of the links in the doc block have information about it. I couldn't find any documentation. What is this value supposed to be exactly? The distance in pixels?

Thanks!