Case-sensitivity reduces portability. "Different strokes", I guess. (literally and figuratively!)
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1...
> Uppercase and lowercase letters shall retain their unique identities and shall not be folded together.
> The name space of environment variable names containing lowercase letters is reserved for applications.
alt Hacker News
https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1...
> Uppercase and lowercase letters shall retain their unique identities and shall not be folded together.
> The name space of environment variable names containing lowercase letters is reserved for applications.