URI malformed with dynamic route

[yaniv51]

Version

3.0.3

Reproduction link

https://codesandbox.io/s/mw8di

Steps to reproduce

Open:
https://mw8di.codesandbox.io/#/test/error/100%

What is expected?

Page with 'Error' text

What is actually happening?

URI malformed error page

---

I found this error while using Nuxt.js, related bug:
nuxt/nuxt#5827

[posva]

mw8di.codesandbox.io/#/test/error/100% is not a legal URL, the % character must be encoded (it's %25, try encodeURI), this is a browser spec

[yaniv51]

Did you checked the related issue?
https://quzpq.sse.codesandbox.io/90%25
The request is fully encoded but still there is an exception in vue-router.

The only way I think it might be is that there is an issue with Nuxt.js and while handle request, nuxt is decode path (-> instead of 90%25 we get 90%) and the vue-router try to decode it again -> the exception raised.

[posva]

Please, see #2725