fix: deduplicate identical route params

[Anoesj]

Right now, route params of nested routes are sometimes duplicated, e.g.:

/* eslint-disable */
/* prettier-ignore */
// @ts-nocheck
// Generated by unplugin-vue-router. ‼️ DO NOT MODIFY THIS FILE ‼️
// It's recommended to commit this file.
// Make sure to add this file to your tsconfig.json file as an "includes" or "files" entry.

declare module 'vue-router/auto-routes' {
  import type {
    RouteRecordInfo,
    ParamValue,
    ParamValueOneOrMore,
    ParamValueZeroOrMore,
    ParamValueZeroOrOne,
  } from 'vue-router'

  /**
   * Route name map generated by unplugin-vue-router
   */
  export interface RouteNamedMap {
    'projects': RouteRecordInfo<'projects', '/', Record<never, never>, Record<never, never>>,
    'project': RouteRecordInfo<'project', '/project/:projectId()', { projectId: ParamValue<true> }, { projectId: ParamValue<false> }>,
    'project-view': RouteRecordInfo<'project-view', '/project/:projectId', { projectId: ParamValue<true>, projectId: ParamValue<true> }, { projectId: ParamValue<false>, projectId: ParamValue<false> }>,
  }
}

This small change deduplicates params that are identical (on a string basis) and is probably basically a quickfix. I'm not sure if it's theoretically possible for a param to be included multiple times with different values? If more work is needed, let me know!

[posva]

Thanks, but this should not be needed because the routes are stored in a tree, so there is no duplication

[Anoesj]

Apparently, I ran into a Nuxt issue, where params are duplicated in the tree when using definePageMeta to set the path property. Even if the provided path is identical to the path generated by unplugin-vue-router (or Nuxt?), the params are duplicated in the tree, and therefor in the typed router DTS. I closed this PR and will dig a little deeper into why this happens.