fix: route matching for encoded pathnames

[ktym4a]

fix: #9933

Changes

Decode pathnames to check.

Testing

I don't know where to add testcases.
Should I add in dev-routing.test.js? and also add in preview-routing.test.js?

Docs

I don't think to update.

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[matthewp]

dev-routing.test.js would be great.

The CI failing is unrelated to your change. Sorry about that, we're working on it.