Trailing slash in url breaks routing

[rhyme999]

What you were expecting:
If I open list page with trailing slash in url like localhost:3000/posts/ , then all the links shoud still have correct paths, like /posts/create or /posts/12/show .

What happened instead:
Links get wrong path with two slashes, like /posts//create and /posts//12/show , so routing breaks

Steps to reproduce:
Just set trailing slash in url, open list page or reload.

Related code:
https://codesandbox.io/s/github/marmelab/react-admin/tree/master/examples/simple

Other information:
Screens with reproduce
https://prnt.sc/pgf2qv
http://prntscr.com/pgf28t

Bug can be reproduced both for hash histrory and browser histrory

It seems like there was a similar bug, solved here #1108 . But it is still not working

Environment

• React-admin version: 2.9.6