fix(react-router): allow union when assigning

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commit: 5865461

[GiovaniGuizzoYUB]

This PR has broken my application's search params. I have a param A that's optional from the root route and a param B that's also optional from a page. It essentially makes the page's search param types to be something like this:

{ A: {}; } | { B: string; } | { A: {}; B: string; } | undefined

This type is basically unusable and TypeScript throws an error when I try to use search param B:

Property 'B' does not exist on type '{ A: {}; }'