*This is a package intended for internal Unity Development Projects and as such this package is not supported. Use at your own risk.*
so, do you mean that we should NOT use this package by ourselves?
Why DONT you add another namespace for it, if you just use it as an internal package???
It means you will not get any support when using this package. Same as when you get Newtonsoft Json elsewhere and put it in your Unity project. You can certainly use that package but you‘ll be locked into the specific json version used by the package. Which in 99.999% of all cases is a non-issue.