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Changes between Initial Version and Version 1 of Ticket #37264, comment 7

initial	v1
5	5	If you take the scenario where the file was created as `www-data` and your FTP user is running as `dd32` and does NOT share a common group (not as insane as you may think it is) then `444` / `666` is suddenly the most relaxed permissions you can choose for the file.
6	6
7		We attempted to lower the permissions set to `640` in #20069 which failed miserably, which is why they're back at `644` for upgrades.
	7	We attempted to lower the permissions set to `640` in #20069 which failed miserably, which is why they're back at `644` for upgrades (If the permissions of index.php is > `644`, such as `666` then we use `666`)
8	8
9	9	I don't think there's any changes that can be made here which won't result in broken cases for a subset of users, where they won't be able to modify their `wp-config.php` file via FTP or control panels. These sort of issues will NEVER be seen on a decent host, or any test environment that we set up, it'll always be those hosts that you don't want to touch, or have never heard of that will cause pain.