Localization duplicate page problem when locale set in routes

I'd agree with you that this is functionality that may make sense in core. More often than not, people are probably going to have to dance around the issues you faced.

Maybe there's some compelling reason why it's this way, but it's probably a good idea to open an issue on Github and let the team weigh in on it. 

https://github.com/codeigniter4/CodeIgniter4/issues

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