Handling cookie in sub-domains

[aziyatali]

As modern browsers started automatically not-caring the trailing dot, it seems to be chanllenging to handle cookies between enviroments.

When I have domain.com and staging.domain.com, staging.domain.com keep reading the values of the domain.com.
I could handle it by adding env value to the cookie names, but it seems not good approach when I have lots of cookies to manage.

How do you guys handle this case? Do we have hostonly option?