What's the right ownership for /usr/local for current macOS and Homebrew versions? Someone told me that


  Homebrew no longer requires /usr/local/ to have an ownership such that it can be written by brew commands ...


I recall long time ago I have to manually change the ownership for files and directories in /usr/local/. 

Now how do I change them back and what is the default or best ownership setting for files and directories in /usr/local/ for the newest macOS and Homebrew versions?
The correct ownership is root:wheel with permissions of 755.