route.path is not editable in extendRoute

[PindaPixel]

Regarding #468 (comment)

When editing route.path, the path stays unchanged.

This causes #468 (comment) to still occur

e.g.:

extendRoute(route) 
{
    console.log(route.path); // "question/:q-id"
    route.path = "question/:qId";
    console.log(route.path); // still "question/:q-id"
}

Edit:
I just saw https://github.com/posva/unplugin-vue-router/blob/main/src/core/extendRoutes.ts#L144, adding a leading slash would break my route hierarchy.

[posva]

Duplicate of #341