[erlang-questions] why the application env is only accepting atoms as Key

[Benoit Chesneau]

When trying to upgrade an application, we noticed on a project that the
application `env` settings is only accepting atoms as keys:

https://github.com/erlang/otp/blob/maint/lib/sasl/src/systools_make.erl#L685-L689

and

https://github.com/erlang/otp/blob/maint/lib/sasl/src/systools_make.erl#L2000-L2002


Is there any reason for that? Why not accepting any term there?

- benoit
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